Mechanisms of the synthesis of trialkylsubstituted alkenylboronates from unactivated internal alkynes catalyzed by copper: A theoretical study
Publication date: Available online 14 March 2018 Source:Journal of Organometallic Chemistry Author(s): Lingli Han, Benzhen Xu, Tao Liu The mechanisms of copper-catalyzed trialkylsubstituted alkenylboronates reaction from unactivated internal alkynes were studied by using density functional theory (DFT). Our calculations suggest that the additive KO t Bu plays an important role for the initiation of the precatalyst. The electrophilic addition (E-A) mechanism is calculated to be more favorable than the oxidation addition-reductive elimination (O-R) one. Through investigating the origin of ligand-controlled regioselectivity,...
Source: Journal of Organometallic Chemistry - March 14, 2018 Category: Chemistry Source Type: research

Di(N-heterocyclic carbene) gold(III) imidate complexes obtained by oxidative addition of N-halosuccinimides
Publication date: Available online 12 March 2018 Source:Journal of Organometallic Chemistry Author(s): Marco Baron, Marco Dalla Tiezza, Alice Carlotto, Cristina Tubaro, Claudia Graiff, Laura Orian The reaction between the gold(I) dicarbene complexes [Au2(μ2-MeIm(CH2)nImMe)2](PF6)2 (Im = imidazol-2-ylidene, n = 1, 2, 3) and N-bromosuccinimide affords the gold(III) complexes [{AuBr(N-suc)}2(μ2-MeIm(CH2)nImMe)2](PF6)2, in which both gold centres have a bromide and a N-succinimidate anion in the coordination sphere. In the case of the CH2CH2 bridge, two different conformers of the gold(III) complex are formed; t...
Source: Journal of Organometallic Chemistry - March 12, 2018 Category: Chemistry Source Type: research

Synthesis and transition metal chemistry of ferrocenylbis(benzo-oxazaphosphininone)
Publication date: Available online 10 March 2018 Source:Journal of Organometallic Chemistry Author(s): Pandey Sameer Prasad, Maravanji S. Balakrishna The new ferrocenylbis(oxazaphosphininone), [Fe{C5H4P(OC6H4)(CO)N-(C2H4Cl)}2] (1) was synthesized by the reaction of bis(dichlorophosphino)ferrocene with two equivalents of 2(2′-hydroxy)phenyloxazoline in the presence of triethylamine in 83% yield. The reactions of 1 with aq. H2O2 or elemental sulfur afforded bis-chalcogenides [Fe{C5H4P(E)(OC6H4)(CO)N(C2H4Cl)}2] (2 E = O, 3 E = S). Treatment of 1 with [M(CO)4(C5H11N)2] (M = Mo, W), [RuCp(PPh3)2Cl] and [M...
Source: Journal of Organometallic Chemistry - March 11, 2018 Category: Chemistry Source Type: research

Synthesis and characterization of monoanionic salts of p-tert-butylcalix[7]arene
Publication date: Available online 9 March 2018 Source:Journal of Organometallic Chemistry Author(s): Mariana Flores-Jarillo, Simplicio González-Montiel, Verónica Salazar-Pereda, Daniel Mendoza-Espinosa The synthesis and full characterization of a new series of p-tert-butylcalix [7]arene ( t BuC7) monoanions of the type t BuC7•M (M = Na, K, Rb, Cs) is reported. Crystal structures of t BuC7•K and t BuC7•Rb feature monomeric units and represent the first examples of solid state characterized t BuC7 salts. The alkali metal base strength and reaction stoichiometry used for the selective format...
Source: Journal of Organometallic Chemistry - March 10, 2018 Category: Chemistry Source Type: research

Structural analysis of imino- and amino-pyridine ligands for Ni(II):Precatalysts for the polymerization of ethylene
Publication date: Available online 10 March 2018 Source:Journal of Organometallic Chemistry Author(s): Danielle M. Lovett, Laura M. Thierer, Earl E.P. Santos, Rachel L. Hardie, William G. Dougherty, Nicholas A. Piro, W. Scott Kassel, Brian M. Cromer, E. Bryan Coughlin, Deanna L. Zubris Imino- and amino-pyridine ligands are versatile scaffolds to probe how ligand sterics influence polymerization outcomes for nickel(II) ethylene polymerization catalysts. Six imino- and one amino-pyridine nickel(II) complexes with varied imino/amino-carbon substitution (R1 = methyl, ethyl, isopropyl or tert-butyl) were synthesized (1-7)....
Source: Journal of Organometallic Chemistry - March 10, 2018 Category: Chemistry Source Type: research

Catalytic asymmetric synthesis of Pt- and Pd-PCP pincer complexes bearing a para-N pyridinyl backbone
Publication date: Available online 10 March 2018 Source:Journal of Organometallic Chemistry Author(s): Esther Hui Yen Wong, Yu-Xiang Jia, Yongxin Li, Sumod A. Pullarkat, Pak-Hing Leung A diastereoselective catalytic asymmetric hydrophosphination reaction was performed using a palladacycle catalyst to produce chiral PCP phosphine ligand with high dr (95:5) and excellent enantioselectivity (>99% ee). Subsequent facile metalation of the chiral ligand with Pt and Pd metal salts yielded the desired pincer complexes. The protonated form of these pincer complexes was also synthesised, and their structures were confirmed t...
Source: Journal of Organometallic Chemistry - March 10, 2018 Category: Chemistry Source Type: research

A DFT mechanistic study on gold(I)-catalyzed cascade reaction of aminaloalkyne involving Petasis-Ferrier cyclization
Publication date: Available online 10 March 2018 Source:Journal of Organometallic Chemistry Author(s): Jing Shi, Siwei Bi, Yuan-Ye Jiang, Yuxia Liu, Baoping Ling, Xiang-Ai Yuan The reaction mechanism of gold(I)-catalyzed cascade reaction of aminaloalkynes involving Petasis-Ferrier arrangement was studied with the aid of density functional theory calculations. Our study showed that two mechanisms proposed by the Patil group and by us are possible. With the substrate bearing a -C≡C-H component the mechanism by us is preferred in which the reaction undergoes first a Petasis-Ferrier rearrangement. With the substrate bea...
Source: Journal of Organometallic Chemistry - March 10, 2018 Category: Chemistry Source Type: research

General synthesis of pyrido[1,2-a]indoles via Pd-catalyzed cyclization of o-picolylbromoarenes
Publication date: Available online 7 March 2018 Source:Journal of Organometallic Chemistry Author(s): Padon Chuentragool, Zhou Li, Katrina Randel, Faraj Mahchi, Ishmael Ochi, Shadi Assaf, Vladimir Gevorgyan An efficient Pd-catalyzed cyclization of o-picolylbromoarenes into pyridoindoles has been developed. This novel transformation, which proceeds through a not common for Pd catalysis L-to X-type pyridine ligand swap, provides an efficient route to aryl-, as well as to cyanopyrido[1,2-a]indoles, not easily accessible by existing cyclization methods. Graphical abstract (Source: Journal of Organometallic Chemistry)
Source: Journal of Organometallic Chemistry - March 8, 2018 Category: Chemistry Source Type: research

Use of MnCl2/tBuOOH oxidizing system for conversion of p-tolyldisiloxanes to p-carboxyphenyldisiloxanes
Publication date: Available online 8 March 2018 Source:Journal of Organometallic Chemistry Author(s): Irina K. Goncharova, Ashot V. Arzumanyan, Sergey A. Milenin, Aziz M. Muzafarov The possibility of Mn-catalyzed oxidation of p-tolyldisiloxanes 1a-b to the corresponding p-carboxyphenyldisiloxanes 2a-b was studied using a commercially available and inexpensive system based on MnCl2/ t BuOOH. Products 2a and 2b were isolated in 51% and 32% yields, respectively. Graphical abstract (Source: Journal of Organometallic Chemistry)
Source: Journal of Organometallic Chemistry - March 8, 2018 Category: Chemistry Source Type: research

Luminescence properties of carborane-containing distyrylaromatic systems
Publication date: Available online 5 March 2018 Source:Journal of Organometallic Chemistry Author(s): Mahdi Chaari, Justo Cabrera-González, Zsolt Kelemen, Clara Viñas, Albert Ferrer-Ugalde, Duane Choquesillo-Lazarte, Abdelhamid Ben Salah, Francesc Teixidor, Rosario Núñez A set of distyrylbenzene, distyrylbiphenyl and distyrylanthracene end-substituted with carborane clusters is introduced herein. All these compounds have been prepared from the corresponding styrene-containing carborane derivatives via Heck coupling reaction. High regioselectivity has been achieved yielding exclusively E isomers...
Source: Journal of Organometallic Chemistry - March 6, 2018 Category: Chemistry Source Type: research

Hydrophobicity and glutathione peroxidase-like activity of substituted salicyloyl-5-seleninic acids: Re-investigations on aromatic selenium compounds based on their hydrophobicity
Publication date: Available online 6 March 2018 Source:Journal of Organometallic Chemistry Author(s): Sun-Chol Yu, Dong-Myong Ri, Hartmut Kühn Previously we have shown that some of 5-selenized salicylic acid derivatives exhibit glutathione peroxidase (GPx)-like activities higher than or equal to ebselen [Yu et al., Chem. Eur. J., 2008, 14, 7066; Org. Biomol. Chem., 2010, 8, 828]. For understanding the absence of GPx-like activity of the homologue of 5-seleninic anhydride of salicyloylglycine with a loger side chain, we have further synthesized 19 new derivatives (5-seleninic acids of methyl or phenyl salicylates, N-s...
Source: Journal of Organometallic Chemistry - March 6, 2018 Category: Chemistry Source Type: research

New phosphine-amino-alcohol tridentate ligands for ruthenium catalyzed asymmetric transfer hydrogenation of ketones
Publication date: Available online 6 March 2018 Source:Journal of Organometallic Chemistry Author(s): Orhan Altan, Mustafa Kemal Yılmaz New phosphine-amino-alcohol tridentate ligands (3a-c) and six new ruthenium complexes (4a-c and 5a-c) were synthesized and characterized. Catalytic activities of the metal complexes were tested on aryl alkyl ketones. All of the substrates were converted to related sec-alcohols in excellent yields (up to 99%), but enantioselectivities were insufficient (up to 40% ee). Despite the catalytic performance of 5a-c complexes can be considered as better than 4a-c, actually the catalytic activity...
Source: Journal of Organometallic Chemistry - March 6, 2018 Category: Chemistry Source Type: research

Covalent functionalization and solubilization of multi-walled carbon nanotubes by using zinc and copper complexes of meso-tetra(4-aminophenyl) porphyrin
Publication date: Available online 6 March 2018 Source:Journal of Organometallic Chemistry Author(s): G. Prabhavathi, R. Yamuna, Alifia C. Jafer Zinc (II) and copper (II) complexes of mesotetra(4-aminophenyl)porphyrin (Zn-TAP and Cu-TAP) were covalently connected to multi-walled carbon nanotube (MWCNT) through an amide linkage and characterized by using many spectroscopic techniques. Significant modification in the FT-IR and XP spectra confirms the covalent functionalization of Zn-TAP and Cu-TAP with MWCNT. Linking Zn-TAP and Cu-TAP with MWCNTs substantially improves their solubility in many solvents. TGA plots of MWCNT-Z...
Source: Journal of Organometallic Chemistry - March 6, 2018 Category: Chemistry Source Type: research

Synthesis of 8-alkoxy and 8,8 ′-dialkoxy derivatives of cobalt bis(dicarbollide)
Publication date: Available online 6 March 2018 Source:Journal of Organometallic Chemistry Author(s): Marina Yu. Stogniy, Kyrill Yu. Suponitsky, Alexander O. Chizhov, Igor B. Sivaev, Vladimir I. Bregadze In this paper, a simple and convenient way for synthesis of common alkoxy derivatives of cobalt bis(dicarbollide) was developed and a series of 8-alkoxy [8-RO-3,3′-Co(1,2-C2B9H10)(1,2-C2B9H11)]-, 8-alkoxy-8′-hydroxy [8-RO-8′-HO-3,3′-Co(1,2-C2B9H10)2]- and 8,8′-dialkoxy derivatives [8,8′-(RO)2-3,3′-Co(1,2-C2B9H10)2]- (R = Me, Et, Pr) were synthesized. The solid state structure ...
Source: Journal of Organometallic Chemistry - March 6, 2018 Category: Chemistry Source Type: research

Organotin(IV) compounds derived from ibuprofen and cinnamic acids, an alternative into design of anti-inflammatory by the cyclooxygenases (COX-1 and COX-2) pathway
Publication date: Available online 5 March 2018 Source:Journal of Organometallic Chemistry Author(s): Maria M. Romero-Chávez, Kayim Pineda-Urbina, David J. Pérez, Fernando Obledo-Benicio, Angelina Flores-Parra, Zeferino Gómez-Sandoval, Ángel Ramos-Organillo New tributyl-, dibutyl- and diphenyl-tin(IV) complexes derived from ibuprofen and cinnamic acids were synthesized. All compounds were structurally characterized by FT-IR, multinuclear 1H, 13C, 19F and 119Sn NMR and corroborated by 2D spectra. The NMR data in CDCl3 revealed several hexacoordinated compounds with octahedral geometry. Moreover,...
Source: Journal of Organometallic Chemistry - March 5, 2018 Category: Chemistry Source Type: research

Cyrhetrenylaniline and new organometallic phenylimines derived from 4- and 5-nitrothiophene: Synthesis, characterization, X-Ray structures, electrochemistry and in vitro anti-T. brucei activity
Publication date: Available online 3 March 2018 Source:Journal of Organometallic Chemistry Author(s): Patricia Toro, Constanza Suazo, Alejandra Acuña, Mauricio Fuentealba, Vania Artigas, Rodrigo Arancibia, Claudio Olea-Azar, Mauricio Moncada, Shane Wilkinson, A. Hugo Klahn A novel series of cyrhetrenyl (3a-4a) and ferrocenyl (3b-4b) Schiff bases were synthesized through a condensation reaction, between the known 4-ferrocenylaniline (2b) or the unreported 4-cyhretrenylaniline (2a) with 4- or 5-nitrothiophenecarboxaldehyde. The structure of 2a and the new Schiff bases have been elucidated using conventional spectrosc...
Source: Journal of Organometallic Chemistry - March 4, 2018 Category: Chemistry Source Type: research

DNA, in vitro antimicrobial/anticancer activities and biocidal based statistical analysis of Schiff base metal complexes derived from salicylalidene-4-imino-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one and 2-aminothiazole
Publication date: Available online 2 March 2018 Source:Journal of Organometallic Chemistry Author(s): A. Palanimurugan, A. Kulandaisamy New mono cationic Cu(II), Co(II), Ni(II), VO(II) and Zn(II) Schiff base complexes have been designed and synthesized from salicylalidene-4-imino-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one and 2-aminothiazole. The prominent structural features of synthesized compounds were studied by elemental analysis, UV–Vis., FTIR, 1H-NMR, 13C-NMR, EPR, Fluorescence emission, Powder XRD, FESEM and FAB-Mass spectral measurements. The IR, UV-Vis., spectra and magnetic susceptibility data of the complex...
Source: Journal of Organometallic Chemistry - March 3, 2018 Category: Chemistry Source Type: research

A rare P, C −bridged bimetallic palladium complex
Publication date: Available online 2 March 2018 Source:Journal of Organometallic Chemistry Author(s): Jin Zhang, Baoyan Xing, Jianguo Zhao, Guibin Ma, Robert McDonald, Ronald G. Cavell Reaction of (cod)PdCl2 with two molar equivalents of trimethylphosphine (P(CH3)3) followed by equivalent mole of [Li2L], [L=C(Ph2P=NSi(CH3)3)2]2- (1) in THF at ambient temperature, did not yield the anticipated methanediide-Pd complex. However, a C-H activation of one methyl group of one P(CH3)3 ligand on each of two Pd atoms occurred to form, ultimately, a rare example of an unusual P,C-bridged bimetallic palladium complex [{(H3C)3P)PdCl}2...
Source: Journal of Organometallic Chemistry - March 3, 2018 Category: Chemistry Source Type: research

Synthesis, structure and reactivity of a carborane-fused silylene 1-{[PhC(NtBu)2]Si}-1,2-C2B10H11
Publication date: Available online 2 March 2018 Source:Journal of Organometallic Chemistry Author(s): Hao Wang, Jie Zhang, Zuowei Xie A carborane-fused silylene 1-{[PhC(NtBu)2]Si}-1,2-C2B10H11 (2) has been prepared and structurally characterized from an equimolar reaction of 1-Li-1,2-C2B10H11 with [PhC(N t Bu)2]SiCl (1) in Et2O. The reactions of 2 with elemental sulfur and benzophenone afforded the corresponding o-carborane substituted silanethione (3) and silaoxirane (4), respectively. On the other hand, the reaction of 2 with 2-benzoylpyridine led to the isolation of an unexpected compound 5 featuring a SiC2O2 five-memb...
Source: Journal of Organometallic Chemistry - March 3, 2018 Category: Chemistry Source Type: research

B-phenylated o-carboranes and its chromium derivatives: Synthesis, electrochemical properties, and X-ray structural studies
Publication date: Available online 2 March 2018 Source:Journal of Organometallic Chemistry Author(s): So-Yoen Kim, So-Young Ma, Sang Ook Kang, Jong-Dae Lee The electron accepting capability of B-phenylated o-carborane is greatly improved through favorable electronic interactions between the two adjoining phenyl-π* and cage carbon-σ* orbitals. Phenyl substitution at the boron atom in the 3-position directs the two phenyl groups of the cage carbon atoms to a face-to-face position and locks them into a rigid conformation, which gives rise to extensive electronic delocalization and maximum energy stabilization from t...
Source: Journal of Organometallic Chemistry - March 3, 2018 Category: Chemistry Source Type: research

Synthesis and selected properties of nonahalogenated 2-ammonio-decaborate anions and their derivatives substituted at N-centre
Publication date: Available online 1 March 2018 Source:Journal of Organometallic Chemistry Author(s): Suzan El Anwar, Josef Holub, Oleg Tok, Tomáš Jelínek, Zdeňka Růžičková, Lukáš Fojt, Veronika Šolínová, Václav Kašička, Bohumír Grüner New preparative methods for halogenation of the cage producing the corresponding [2-NH3-B10X9]- species (2 - to 4 - , X = Cl, Br, I) have been developed using halogenations by elemental halogens in a glass pressure vessel. Compared to similar icosahedral species of formulation [1-H3N-B12X11]- (...
Source: Journal of Organometallic Chemistry - March 2, 2018 Category: Chemistry Source Type: research

Synthesis, structure and behavior of vanadium(III) diphosphine complexes in the homo- and Co-polymerization of ethylene with norbornene: The ligand donor strength and bite angle make the difference
Publication date: Available online 27 February 2018 Source:Journal of Organometallic Chemistry Author(s): Giorgia Zanchin, Ivana Pierro, Emilio Parisini, Javier Martí-Rujas, Giovanni Ricci, Giuseppe Leone A series of vanadium (III) complexes containing diphosphine ligands of the type R2P(CH2)2PR2 [R = Me (dmpe, 1a), R = Et (depe, 1b), R = Ph (dppe, 1c)] were synthesized by reacting VCl3(THF)3 with 1.3 equiv. of the corresponding ligand. The molecular structures of 1a and 1b were determined by X-ray crystallography, revealing that both are dimers of the type [VCl3(dmpe)]2(μ-P,P′-dmpe) and [VCl3(...
Source: Journal of Organometallic Chemistry - February 28, 2018 Category: Chemistry Source Type: research

Synthesis and photophysical properties of ferrocene-oligo(benzoateethynylene)- fulleropyrrolidines dyads and triads. Implications in photovoltaic cells
Publication date: Available online 27 February 2018 Source:Journal of Organometallic Chemistry Author(s): J.R. Flores, F. Perez, R.M. Jimenez-Barrera, E. Arias, I. Moggio, R. Torres, G. Rodríguez, M. Ottonelli, R.F. Ziolo A series of fulleropyrrolidines-conjugated bridge-ferrocene or triazene oligomers were selectively synthesized by the Sonogashira reaction by applying the step-by-step approach. The bridge is constituted by 1, 2 and 3 benzoateethynylene units (BzE) and bears triazene (Et2N3) or ferrocene as terminal groups affording the C60-2PEN 3 and C60-3PEN 3 dyads and C60-1PEFe, C60-2PEFe and C60-3PEFe triads....
Source: Journal of Organometallic Chemistry - February 28, 2018 Category: Chemistry Source Type: research

Theoretical investigation on the electronic structures and spectroscopic properties as well as the features as dyes in dye-sensitized solar cells of quinonoid containing Re(I) complexes
Publication date: Available online 26 February 2018 Source:Journal of Organometallic Chemistry Author(s): Xiuyan Ji, Panpan Zhang, Wei Wei, Hongxing Zhang, Baohui Xia A series of Re(I) model complexes with the bidentate NˆO type ligand (NˆO = 2,5-bis(4ʹ-(isopropyl)-anilino)-1,4-benzoquinone) involving quinone group, which are expressed as [Re2(CO)6(NˆO)L2] (L = 4-dimethylaminopyridine) 1, [Re(CO)3(NˆO)L] (L = 4-dimethylaminopyridine a1; 4-carboxylicpyridine a2; ethynyl b1; phenol b2), and [Re(CO)2(NˆO)L] (L = 4,4ʹ-dicarboxyl-2,2ʹ-bipyridine (NˆN)) c1, have been investigated...
Source: Journal of Organometallic Chemistry - February 27, 2018 Category: Chemistry Source Type: research

[Pd(IPr*R)(acac)Cl]: Efficient bulky Pd-NHC catalyst for Buchwald-Hartwig C-N cross-coupling reaction
Publication date: Available online 26 February 2018 Source:Journal of Organometallic Chemistry Author(s): Xiabing Tian, Jing Lin, Sheng Zou, Junwei Lv, Qingfei Huang, Jin Zhu, Shuping Huang, Qiwei Wang A series of bulky palladium catalysts based on N-heterocyclic carbene, (Pd(NHC)(acac)Cl: NHC = IPr*me = N,N′-bis(2,6-bis(di-p-tolylmethyl)-4-methylphenyl)-imidazol-2 -ylidene, Pd(IPr*me)(acac)Cl; NHC = IPr*ipr = N,N′-bis(2,6-bis(di-4-isopropylphenyl)-4-methylphenyl)-imidazol-2 -ylidene, Pd(IPr*ipr)(acac)Cl; and NHC = IPr*tBu = N,N′-bis(2,6-bis(di-4-(tert-butyl)phenyl)- 4-methy...
Source: Journal of Organometallic Chemistry - February 27, 2018 Category: Chemistry Source Type: research

Facile synthesis of pyrazoles by iron-catalyzed regioselective cyclization of hydrazone and 1,2-diol under ligand-free conditions
Publication date: Available online 26 February 2018 Source:Journal of Organometallic Chemistry Author(s): Niranjan Panda, Subhadra Ojha A facile synthesis of pyrazoles by the cyclization of hydrazones and 1,2-diols was described. In the presence of ferric nitrate, the reaction occurs under neat conditions and makes the use of potassium persulfate to oxidize the diol to α-hydroxy carbaldehyde for the reaction with hydrazones to produce 1,3- and 1,3,5-substituted pyrazoles selectively. The overall regioselective transformation occurs in one-pot under ligand-free, mild conditions even in the presence of air. Graphical ...
Source: Journal of Organometallic Chemistry - February 27, 2018 Category: Chemistry Source Type: research

The missing agostomer in the fluxionality of cyclohexenylmanganese tricarbonyl
Publication date: Available online 26 February 2018 Source:Journal of Organometallic Chemistry Author(s): Guangchao Liang, Charles Edwin Webster Fluxionality of the cyclohexenylmanganese tricarbonyl complex [(C6H9)Mn(CO)3], which has an Mn-H-C 3-center 2-electron agostic interaction, have been analyzed with density functional theory (DFT) computations. The fluxionality of this complex is a classic in organometallic chemistry (as highlighted by its inclusion as a study problem in the textbook by Kegley and Pinhas, Problems and Solutions in Organometallic Chemistry), and we provide new insights into its chemistry. Besides t...
Source: Journal of Organometallic Chemistry - February 27, 2018 Category: Chemistry Source Type: research

A sustainable heterogenized palladium catalyst for Suzuki-Miyaura cross coupling reaction of azaheteroaryl halides in aqueous media
Publication date: Available online 27 February 2018 Source:Journal of Organometallic Chemistry Author(s): S. Ganesamoorthy, M. Muthu Tamizh, K. Shanmugasundaram, R. Karvembu A unique recyclable Pd catalyst (‘SiO2’-NH2-Pd) for Suzuki-Miyaura coupling reaction of azaheteroaryl halides is developed. The catalytic system is working under mild aqueous condition with low Pd loading and without the use of phosphine ligand. The plausible mechanism is proposed based on the formation of undesired symmetrical biaryl from the coupling reaction of azaheteroaryl chlorides due to the oxidative homocoupling of nucleophilic ar...
Source: Journal of Organometallic Chemistry - February 27, 2018 Category: Chemistry Source Type: research

Telluroxanes: Synthesis, structure and applications
Publication date: Available online 27 February 2018 Source:Journal of Organometallic Chemistry Author(s): Kriti Srivastava, Arunashree Panda, Sagar Sharma, Harkesh B. Singh This review discusses the syntheses, structures and applications of organotelluroxanes. These compounds have found applications in many areas such as catalysis, oxidation, hydrolysis etc. Weak intermolecular O⋯Te interactions are a common feature in this class of compounds and play an important role in the aggregation, reactivity and properties of such compounds. However, monomeric species could be isolated by employing bulky groups or intramolecular...
Source: Journal of Organometallic Chemistry - February 27, 2018 Category: Chemistry Source Type: research

Synthesis, structure and in vitro cytostatic activity study of the novel organotin(IV) derivatives of p-aminobenzenesulfonic acid
Publication date: Available online 27 February 2018 Source:Journal of Organometallic Chemistry Author(s): Ge-Hua Wen, Ru-Fen Zhang, Qian-Li Li, Shao-Liang Zhang, Jing Ru, Ji-Yuan Du, Chun-Lin Ma Four new p-aminobenzenesulfonate organotin complexes, [(n-Bu3Sn)(O3SC6H3-NH2-4)]n (1), [(n-Bu2Sn)4(O)2(OH)2(O3SC6H4-NH2-4)2] (2), [(Me2Sn)4(O)2(OH)2(O3SC6H4-NH2-4)2] (3) and [{(n-BuSn)12O14(OH)6}(O3SC6H4-NH2-4)2·3C4H8O2] (4·diox), were synthesized by reaction of p-aminobenzenesulfonic acid with tributyltin oxide, dibutyltin oxide, dimethyltin oxide and monobutyltin oxide, respectively. These complexes were characteri...
Source: Journal of Organometallic Chemistry - February 27, 2018 Category: Chemistry Source Type: research

Synthesis of a new bulky phosphite ligand and its application in the enantioselective hydrogenation
Publication date: Available online 24 February 2018 Source:Journal of Organometallic Chemistry Author(s): Marina V. Sokolovskaya, Sergey E. Lyubimov, Igor S. Mikhel, Kirill P. Birin, Vadim A. Davankov A new bulky phosphite ligand was synthesized and tested in the asymmetric Rh-catalyzed hydrogenation of a series of substrates, including dimethyl itaconate (up to 95% ee), α- and β-dehydroamino acid derivatives (up to 88% and 76% ee, respectively). In the Ir-catalyzed hydrogenation of 2-methylindole, the use of iodine as an additive led to a significant increase in the enantioselectivity and conversion. The best ...
Source: Journal of Organometallic Chemistry - February 25, 2018 Category: Chemistry Source Type: research

The synthesis of brominated heteroleptic tris-cyclometallated Ir(III)-complexes as photoactive building blocks on polyaryl backbones
Publication date: Available online 25 February 2018 Source:Journal of Organometallic Chemistry Author(s): Jens Langecker, Oliver Karg, Reinhard Meusinger, Matthias Rehahn Luminescent facial tris-cyclometallated iridium complexes of generic structure Ir(L)2(dbppy) with one 2-(4-bromophenyl)-5-bromopyridyl (dbppy) ligand {where L represents the cyclometallating ligands [2-phenylpyridyl (ppy), 2-(4,6- difluorophenyl)pyridyl] (dfppy), [1-phenylpyrazole] (ppz) or [1-(4,6-difluorophenyl)pyrazole] (dfppz)} were synthesized. The bromine substituents allow the further incorporation of the iridium complexes into a polyaryl backbone...
Source: Journal of Organometallic Chemistry - February 25, 2018 Category: Chemistry Source Type: research

Selective cytotoxicity of arene tricarbonylchromium towards tumour cell lines
Publication date: Available online 24 February 2018 Source:Journal of Organometallic Chemistry Author(s): Jihene Elloumi-Mseddi, Sami Mnif, Nejmeddine Akacha, Bochra Hakim, Pascal Pigeon, Gérard Jaouen, Siden Top, Sami Aifa Metals are cytotoxic and could be harmful to human health; however, as their effects are dose dependant, some of them could be used in chemotherapy. In the present work, mineral chromium (VI) showed that it is cytotoxic on both tumour (MCF-7, HeLa, Hep2 and Caco-2) and non-tumour (HEK293) cell lines. Interestingly, among seven complexes of arene tricarbonylchromium, chromium (0) becomes more eff...
Source: Journal of Organometallic Chemistry - February 24, 2018 Category: Chemistry Source Type: research

Sonogashira-type cross-coupling reactions catalyzed by copper complexes of pincer N-heterocyclic carbenes
Publication date: Available online 22 February 2018 Source:Journal of Organometallic Chemistry Author(s): Doaa Domyati, Reza Latifi, Laleh Tahsini Copper complexes of N-heterocyclic carbenes (NHC) have recently received great attention in catalysis, however, the application scope has been limited to neutral complexes bearing monodentate ligands. Herein, we report the synthesis and full characterization of a cationic Cu-pincer bis(NHC) complex with bulky tert-butyl wingtips that serves as catalyst for the coupling of aryl iodides and phenylacetylene, alongside its analogs with small alkyl substituents. Unlike other copper ...
Source: Journal of Organometallic Chemistry - February 23, 2018 Category: Chemistry Source Type: research

1,1-Carboboration of alkynylgermanes – New germoles
Publication date: Available online 23 February 2018 Source:Journal of Organometallic Chemistry Author(s): Bernd Wrackmeyer, Stefan Bayer, Wolfgang Milius, Elena V. Klimkina The C≡C bonds of various alkynylgermanes [Cl(H)Ge(C≡C–R1)2, Cl2Ge(C≡C–R1)2 with R1 = nBu, SiMe3, and Ge(C≡C–R1)4 with R1 = SiMe3] undergo 1,1-carboboration when treated with an excess of triethylborane at 80–110 °C. All pure final products with R1 = SiMe3 possess germole-derived structures. Intermediates and side products as a result of lost stereoselectivity of the 1,1-carboborations co...
Source: Journal of Organometallic Chemistry - February 23, 2018 Category: Chemistry Source Type: research

Buchwald-Hartwig reaction: An overview
Publication date: Available online 21 February 2018 Source:Journal of Organometallic Chemistry Author(s): Majid M. Heravi, Zohreh Kheilkordi, Vahideh Zadsirjan, Masumeh Heydari, Masoumeh Malmir Pd-catalyzed amination reaction of aryl halides has attracted much attention in recent years. This review underscores selected important recent developments in the catalysis of one of the kind amination reaction so-called Buchwald-Hartwig amination reaction. This development has been achieved via utilization of sterically hindered phosphine ancillary ligands. Our purpose here is giving information to the readers about recent advanc...
Source: Journal of Organometallic Chemistry - February 22, 2018 Category: Chemistry Source Type: research

Iron catalyzed hydrogenation and electrochemical reduction of CO2: The role of functional ligands
Publication date: Available online 22 February 2018 Source:Journal of Organometallic Chemistry Author(s): Arne Glüer, Sven Schneider The reduction of CO2 is an attractive route to utilize the green-house gas as a C1 building block. In recent years, the scientific progress that could be obtained for CO2 hydrogenation to formate and electrochemical reduction mainly to CO was strongly driven by the development of molecular iron catalysts with high activities and selectivities. However, these advances are also associated with the utilization of functional ligands that facilitate, e.g. H2 heterolysis in thermal hydrogenat...
Source: Journal of Organometallic Chemistry - February 22, 2018 Category: Chemistry Source Type: research

Synthesis and biological evaluation of closo-dodecaborate ibuprofen conjugate (DIC) as a new boron agent for neutron capture therapy
Publication date: Available online 21 February 2018 Source:Journal of Organometallic Chemistry Author(s): Satomu Ishii, Hiroyuki Nakamura A closo-dodecaborate ibuprofen conjugate (DIC) 1 was synthesized via amide bond formation between ibuprofen activated with 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDCI) and 4-aminoethoxyethoxy-closo-dodecaborate 3 which was synthesized via the ring opening reaction of 1,4-dioxane-closo-dodecaborate complex 2 with ammonia in aqueous solution. DIC showed no significant binding affinity to HSA site 2, which is known as an ibuprofen binding site. DIC accumulated in HeLa cells in a ti...
Source: Journal of Organometallic Chemistry - February 21, 2018 Category: Chemistry Source Type: research

Unprecedented oxidation of aldimine to carboxamido function during reactivity studies on ruthenium complex with acidified nitrite solution: Synthesis of ruthenium nitrosyl complex having {RuNO}6 moiety and photorelease of coordinated NO
Publication date: Available online 19 February 2018 Source:Journal of Organometallic Chemistry Author(s): Rajan Kumar, Sushil Kumar, Manju Bala, Anand Ratnam, U.P. Singh, Kaushik Ghosh Ruthenium(II) complex namely [Ru(L1)(PPh3)Cl2] (1) [where L1 = N-(pyridin-2-ylmethylene)quinolin-8-amine] derived from the tridentate ligand containing two pyridine and one imine donors was synthesized. This ruthenium(II) complex was treated with acidified nitrite solution to afford a ruthenium nitrosyl complex [Ru(L2)(PPh3)(NO)Cl](ClO4) (2) [where L2 = N-(quinolin-8-yl)picolinamide]. These complexes were characterized by elemental ...
Source: Journal of Organometallic Chemistry - February 19, 2018 Category: Chemistry Source Type: research

Cobaltabisdicarbollide based metallodendrimers with cyclotriphosphazene core
Publication date: Available online 19 February 2018 Source:Journal of Organometallic Chemistry Author(s): Chandra S. Mahanta, Rupesh Bhavsar, Barada P. Dash, Rashmirekha Satapathy Cyclotriphosphazene core based metallodendrimers containing six and twelve cobalt bis(dicarbollide) moieties on the periphery have been synthesized. The ring opening reaction of the cyclic oxonium derivative of the cobalt bis(dicarbollide) anion, [3,3′-Co(8-C4H8O2-1,2-C2B9H10)(1′,2′-C2B9H11)], has been efficiently used for the synthesis of the dendrimers. The newly synthesized dendrimers have been characterized by 1H, 13C, 11B,...
Source: Journal of Organometallic Chemistry - February 19, 2018 Category: Chemistry Source Type: research

Steric factors on unsymmetrical O-hydroxyaryl N-Heterocyclic carbene ligands prevailing the stabilization of single stereoisomer of bis-ligated titanium complexes
Publication date: Available online 19 February 2018 Source:Journal of Organometallic Chemistry Author(s): Coralie C. Quadri, Ralte Lalrempuia, Nils Åge Frøystein, Karl W. Törnroos, Erwan Le Roux Bis-ligated titanium (IV) metal complexes supported by bidentate unsymmetrical o-hydroxyaryl-substituted N-heterocyclic carbene ligands were synthesized and structurally identified. While the direct addition of the doubly deprotonated bulky imidazolidinium chloride salts [Dipp,4-RNHC-H]Cl (with Dipp = 2,6-diisopropylphenyl, R = H (2-hydroxyphenyl), and R = Me (2-hydroxy-4-methyl-phenyl)) with chloro-t...
Source: Journal of Organometallic Chemistry - February 19, 2018 Category: Chemistry Source Type: research

Acryloylferrocene as a convenient precursor of tetrahydropyrazolopyrazolones: [3+2] cycloaddition with N,N ′-Cyclic azomethine imines
Publication date: Available online 17 February 2018 Source:Journal of Organometallic Chemistry Author(s): Jovana P. Jovanović, Sladjana B. Novaković, Goran A. Bogdanović, Aleksandra Minić, Anka Pejović, Jelena Katanić, Vladimir Mihailović, Branislav Nastasijević, Dragana Stevanović, Ivan Damljanović AlCl3-Catalyzed [3 + 2] dipolar cycloaddition of the N,N′-cyclic azomethine imines to the acryloylferrocene enabling access to the series of 5-substituted 6-ferrocenoyl tetrahydropyrazolo [1,2-a]pyrazol-1(5H)-ones. This facile methodology shows high substituent tolerance. Furthermore, easy chromatogra...
Source: Journal of Organometallic Chemistry - February 18, 2018 Category: Chemistry Source Type: research

Synthesis and luminescence properties of cyclometalated iridium(III) complexes incorporating conjugated benzotriazole units
Publication date: Available online 17 February 2018 Source:Journal of Organometallic Chemistry Author(s): Emily E. Langdon-Jones, Benjamin D. Ward, Simon J.A. Pope The stepwise synthesis of imidazo[4,5-f]-1,10-phenanthroline-based ligands that incorporate conjugated benzotriazole units are described. Corresponding cyclometalated Ir(III) complexes of the type [Ir(CˆN)2(L)]BF4 (where CˆN = cyclometalating ligand; L = phenanthroline type ligand) are reported. The complexes were characterized using a variety of techniques, including IR, NMR, UV-vis. spectroscopies, mass spectrometry and cyclic voltammetry. T...
Source: Journal of Organometallic Chemistry - February 18, 2018 Category: Chemistry Source Type: research

Carbon-carbon bonds with CO2: Insights from computational studies
Publication date: Available online 17 February 2018 Source:Journal of Organometallic Chemistry Author(s): Marc Obst, Ljiljana Pavlovic, Kathrin H. Hopmann In this mini-review, we provide an overview of recent computational studies on homogeneous transition-metal catalyzed carbon-carbon bond formation with CO2. We cover substitution and addition reactions involving different metals (mainly Ni, Rh, Cu) and substrates (alkanes, alkenes, alkynes, arenes) with focus on the mechanistic details. The CO2 insertion step is generally found to be rate-limiting. The reported transition state geometries for C-C bond formation mostly d...
Source: Journal of Organometallic Chemistry - February 18, 2018 Category: Chemistry Source Type: research

Chemistry of Hume-Rothery inspired organometallics: Selective functionalization of [M(ZnCp*)4(ZnCH3)4] (M = Ni, Pd, Pt) with terminal alkynes to yield [M(ZnCp*)4(ZnCCSiiPr)4]
Publication date: Available online 17 February 2018 Source:Journal of Organometallic Chemistry Author(s): Julius Hornung, Jana Weßing, Mariusz Molon, Katharina Dilchert, Christian Gemel, Roland A. Fischer The all-zinc coordinated group-8 metal complexes [M(ZnCp*)4(ZnCCSi( i Pr)3)4] (M = Ni (1), Pd (2), Pt (3)) were obtained by selective functionalization of the protecting organic ligand shell starting out from the organometallic MZn8-complexes [M(ZnCp*)4(ZnMe)4]. The reaction with excess HCCSi( i Pr)3 leads to a stepwise exchange of the methyl to alkynyl groups under liberation of methane over very long reaction...
Source: Journal of Organometallic Chemistry - February 18, 2018 Category: Chemistry Source Type: research

Chemically C-B bonded C60/CoB composite and its enhanced electrochemical hydrogen storage property
Publication date: Available online 17 February 2018 Source:Journal of Organometallic Chemistry Author(s): Linna Sha, Peng Gao, Xiaobo Li, Xuefeng Bai In this work, amorphous CoB has been uniformly coated on C60 surfaces through a simple ball milling process. Accordingly their XRD, SEM and TEM measurements clarify their related composite structures. Especially, a C-B chemical bond has been found through its XPS measurement, which enhanced the composite's stability and electrochemical activity. And the following electrochemical experimental results demonstrated that the as-obtained C60/CoB composite had considerably high st...
Source: Journal of Organometallic Chemistry - February 18, 2018 Category: Chemistry Source Type: research

Sonogashira cross-coupling reaction catalysed by mixed NHC-Pd-PPh3 complexes under copper free conditions
Publication date: Available online 16 February 2018 Source:Journal of Organometallic Chemistry Author(s): Nedra Touj, Sedat Yaşar, Namık Özdemir, Naceur Hamdi, İsmail Özdemir Mixed NHC–Pd–PPh3 complexes with a methoxyethyl-substituted N-heterocyclic carbene (NHC) were synthesised and characterised by NMR, HRMS, elemental analysis and X-ray crystallography for complex 3b. These complexes were applied to Sonogashira cross-coupling reactions between aryl bromides and phenylacetylene in DMF at 80 °C. All palladium complexes were stable and showed high catalytic activity in Sonogashira reactions ...
Source: Journal of Organometallic Chemistry - February 17, 2018 Category: Chemistry Source Type: research

[3+2] Cycloaddition of ruthenium azido complex with Ethyl propiolate and related reactions
Publication date: Available online 16 February 2018 Source:Journal of Organometallic Chemistry Author(s): Chao-Wan Chang, Ying-Chih Lin, Gene-Hsiang Lee, Yu Wang The [3+2] cycloaddition reaction of ethyl propiolate with ruthenium azido complex [Ru]−N3 (1, [Ru] = (η 5-C5H5)(dppe)Ru, dppe = Ph2PCH2CH2PPh2) has been investigated. The metal-bound heterocyclic complex produced is N(2)-bound triazolate [Ru]N3CHCO2Et (2). A regiospecific alkylation happens by treatment of 2 with organic halides and gives a series of cationic N(1)-bound N(3)-alkylated-4-ethoxycarbonyl triazolato complexes {[Ru]N3(R)C2HCO2Et}[X] (3a,...
Source: Journal of Organometallic Chemistry - February 17, 2018 Category: Chemistry Source Type: research

Description of an unusual hydrogen bond between carborane and a phenyl group
Publication date: Available online 16 February 2018 Source:Journal of Organometallic Chemistry Author(s): Wenli Zou, Xiaolei Zhang, Humin Dai, Hong Yan, Dieter Cremer, Elfi Kraka Boranes and carboranes form non-classical H-bonds with the π-face of an arene provided entropic factors are excluded, for example via a suitably designed template. The self-assembled Ir-dithiolene phosphine complexes of the type [Cp∗Ir(PR3)S2C2B10H10] (R = C6H4X, X = H, F, OMe) provide such a template. Steric crowding causes that one of the B-H bonds of the carborane is positioned above the phenyl plane of R to form a non-classi...
Source: Journal of Organometallic Chemistry - February 16, 2018 Category: Chemistry Source Type: research

Catalytic conversion of vanillic acid to catechol by palladium acetate/bis(aminomethyl)-nido-dicarba-undecaborane (11) system
Publication date: Available online 8 February 2018 Source:Journal of Organometallic Chemistry Author(s): Yinghuai Zhu, Zhiyu Bai, Wen Chuen Phuan, Fatima Abi Ghaida, Narayan S. Hosmane, Jun Ding The vanillic acid was converted to catechol using a catalyst system of PdAc2/[Na]+[7,8-bis(aminomethyl)-nido-C2B9H10]. The 90.3% yield of catechol was achieved from vanillic acid in 4 h using the system at 240 °C. The reaction was also compared using catalyst system of PdAc2/TMEDA (N,N,N′,N′-tetramethylethylenediamine), PdAc2/dppe (1,2-bis(diphenylphosphine)ethane) and Pd/AC (activated carbon) under the same co...
Source: Journal of Organometallic Chemistry - February 15, 2018 Category: Chemistry Source Type: research