COAP-Pd Catalyzed Asymmetric Formal [3+2] Cycloaddition for Optically Active Multistereogenic Spiro Cyclopentane-Indandiones Bearing Cyclic N-Sulfonyl Ketimine Skeletons
We reported a chiral oxamide-phosphine ligand (COAP-Ph)-Pd-catalyzed asymmetric [3+2] cycloaddition reaction between vinyl cyclopropane derived from 1,3-indanedione and 2-vinylcyclopropane-1,1-dicarboxylates with cyclic sulfonyl 1-azadienes. The corresponding reactions provided a series of enantiomerically active spiro cyclopentane-indandione and cyclopentane structures bearing three consecutive stereogenic centers in good yields with good diastereo- and enantioselectivity. The COAP-Pd complex serves not only to promote generation of chiral π-allyl-palladium intermediates and induce the asymmetry of the reaction, but also...
Source: Chemistry, an Asian Journal - April 17, 2024 Category: Chemistry Authors: Xing-Wang Wang Jia-Yu Song Xing-Yun Sun Bai-Lin Wang Sheng-Suo Zhou Jia-Xin Song Bu-Hong Zhang Source Type: research
An Encyclopedic Compendium on Chemosensing Supramolecular Metal-organic gels
Chem Asian J. 2024 Apr 17:e202400258. doi: 10.1002/asia.202400258. Online ahead of print.ABSTRACTChemosensing, an interdisciplinary scientific domain, plays a pivotal role ranging from environmental monitoring to healthcare diagnostics and (inter)national security. Metal-organic gels (MOGs) are recognized for their stability, selectivity, and responsiveness, making them valuable for chemosensing applications. Researchers have explored the development of MOGs based on different metal ions and ligands, allowing for tailored properties and sensitivities, and have even demonstrated their applications as portable sensors such a...
Source: Chemistry, an Asian Journal - April 17, 2024 Category: Chemistry Authors: Arun Sharma Navneet Kaur Narinder Singh Source Type: research
Uranium Oxide Hydrate Frameworks with Dy(III) or Lu(III) Ions: Insights into the Framework Structures with Lanthanide Ions
Chem Asian J. 2024 Apr 17:e202400101. doi: 10.1002/asia.202400101. Online ahead of print.ABSTRACTTwo uranium oxide hydrate frameworks (UOHFs) with either Dy3+ or Lu3+ ions, Dy1.36(H2O)6[(UO2)10UO13(OH)4] (UOHF-Dy) or Lu2(H2O)8[(UO2)10UO14(OH)3] (UOHF-Lu), were synthesized hydrothermally and characterized with a range of structural and spectroscopic techniques. Although SEM-EDS analysis confirmed the same atomic ratio of ~5.5 for U:Dy and U:Lu, they displayed different crystal morphologies, needles for UOHF-Dy in the orthorhombic C2221 space group and plates for UOHF-Lu in the triclinic P-1 space group. Both frameworks are ...
Source: Chemistry, an Asian Journal - April 17, 2024 Category: Chemistry Authors: Yingjie Zhang Kimbal T Lu Timothy A Ablott Rongkun Zheng Source Type: research
Square-planar Tetranuclear Cluster-based Alkaline Earth Metal-organic Frameworks with Enhanced Proton Conductivity
Chem Asian J. 2024 Apr 17:e202400175. doi: 10.1002/asia.202400175. Online ahead of print.ABSTRACTAlkaline earth (AE) metal complexes have garnered significant interest in various functional fields due to their nontoxicity, low density, and low cost. However, there is a lack of systematic investigation into the structural characteristics and physical properties of AE-metal-organic frameworks (MOFs). In this research, we synthesized isostructural MOFs consisting of AE4(μ4-Cl) clusters bridged by benzo-(1,2;3,4;5,6)-tris(thiophene-2'-carboxylic acid) (BTTC3-) ligands. The resulting structure forms a truncated octahedral cage...
Source: Chemistry, an Asian Journal - April 17, 2024 Category: Chemistry Authors: Hui-Pu Wang Jin-Cheng Liu Shu-Fan Li Ya-Ru Meng Gen Zhang Jian Su Source Type: research
Zinc-Substituted Hemoglobin-Albumin Cluster as a Porphyrin-Carrier for Enhanced Photodynamic Therapy
Chem Asian J. 2024 Apr 17:e202400257. doi: 10.1002/asia.202400257. Online ahead of print.ABSTRACTApohemoprotein is focused on the field of theranostics, serving as a porphyrin carrier. Hemoglobin (Hb) consists of α2β2 tetramer with iron(II)-protoporphyrin IX (heme) bound to each globin. However, heme-removed Hb (apoHb) causes dissociation at αβ interfaces and aggregation under physiological conditions. We synthesized a stable apoHb derivative comprising intramolecular-crosslinked apoHb (apoXHb) and human serum albumin (HSA), apoXHb-HSA3. ApoXHb-HSA3 engendered no aggregates in the physiological solutions. Moreover, apo...
Source: Chemistry, an Asian Journal - April 17, 2024 Category: Chemistry Authors: Taiga Yamada Maho Katsumi Kota Ishii Teruyuki Komatsu Source Type: research
Modelling on a Biomimetic [Cu-O-Cu]2+-mediated Methane-to-Methanol Conversion Unveils the Site for Methane Activation
Chem Asian J. 2024 Apr 16:e202400282. doi: 10.1002/asia.202400282. Online ahead of print.ABSTRACTThe Cu-O-Cu core exhibits methane-to-methanol conversion, mirroring the reactivity of the copper-containing enzyme pMMO. Herein, we computationally examined the reactivity of a biomimetic Cu-O-Cu core towards methane-to-methanol conversion. The oxygen atom of the Cu-O-Cu core abstracts hydrogen present in the C-H bond of methane. The spin density at the bridging oxygen helps to abstract hydrogen from the C-H bond. We modulated the spin density of the bridging oxygen by substituting only a single copper atom of the Cu-O-Cu core ...
Source: Chemistry, an Asian Journal - April 17, 2024 Category: Chemistry Authors: Sumangla Arora Puneet Gupta Source Type: research
COAP-Pd Catalyzed Asymmetric Formal [3+2] Cycloaddition for Optically Active Multistereogenic Spiro Cyclopentane-Indandiones Bearing Cyclic N-Sulfonyl Ketimine Skeletons
We reported a chiral oxamide-phosphine ligand (COAP-Ph)-Pd-catalyzed asymmetric [3+2] cycloaddition reaction between vinyl cyclopropane derived from 1,3-indanedione and 2-vinylcyclopropane-1,1-dicarboxylates with cyclic sulfonyl 1-azadienes. The corresponding reactions provided a series of enantiomerically active spiro cyclopentane-indandione and cyclopentane structures bearing three consecutive stereogenic centers in good yields with good diastereo- and enantioselectivity. The COAP-Pd complex serves not only to promote generation of chiral π-allyl-palladium intermediates and induce the asymmetry of the reaction, but also...
Source: Chemistry, an Asian Journal - April 17, 2024 Category: Chemistry Authors: Xing-Wang Wang Jia-Yu Song Xing-Yun Sun Bai-Lin Wang Sheng-Suo Zhou Jia-Xin Song Bu-Hong Zhang Source Type: research
An Encyclopedic Compendium on Chemosensing Supramolecular Metal-organic gels
Chem Asian J. 2024 Apr 17:e202400258. doi: 10.1002/asia.202400258. Online ahead of print.ABSTRACTChemosensing, an interdisciplinary scientific domain, plays a pivotal role ranging from environmental monitoring to healthcare diagnostics and (inter)national security. Metal-organic gels (MOGs) are recognized for their stability, selectivity, and responsiveness, making them valuable for chemosensing applications. Researchers have explored the development of MOGs based on different metal ions and ligands, allowing for tailored properties and sensitivities, and have even demonstrated their applications as portable sensors such a...
Source: Chemistry, an Asian Journal - April 17, 2024 Category: Chemistry Authors: Arun Sharma Navneet Kaur Narinder Singh Source Type: research
Identification of Commercial Stainless-Steel Mesh Size for Electrochemical Oxygen Evolution Reaction
Chem Asian J. 2024 Apr 16:e202400118. doi: 10.1002/asia.202400118. Online ahead of print.ABSTRACTThe study examines the oxygen evolution reaction (OER) electrocatalytic efficiency of various stainless-steel mesh (SSM) sizes in electrolytic cells. Stainless steel is chosen due to its widespread availability and stability, making it an economically viable option. The primary objective of this investigation is to determine the optimal stainless-steel mesh size among those currently widely available on the market. The classification of stainless-steel mesh sizes as SS304 is confirmed by the minimal compositional variations obs...
Source: Chemistry, an Asian Journal - April 16, 2024 Category: Chemistry Authors: Yuda Prima Hardiantoa Mostafa M Mohamed Md Abdul Aziz Zain H Yamani Source Type: research
New Pyridine Dicarbene Ligands with Ring Expanded NHCs and their Nickel and Chromium Complexes
Chem Asian J. 2024 Apr 15:e202400169. doi: 10.1002/asia.202400169. Online ahead of print.ABSTRACTThe pincer complexes [NiIIBr(CNC)]Br (4), [CrIIIBr3(CNC)] (5a) and [CrIIIBr2.3Cl0.7(CNC)] (5b), where CNC = 3,3'-(pyridine-2,6-diyl)bis(1-mesityl-3,4,5,6-tetrahydropyrimidin-2-ylidene), were obtained from the novel ligand CNC, generated in situ from the precursor (CHNCH)Br2 and [NiIIBr2(PPh3)2] or from [CrII{N(SiMe3)2}2(THF)2] and (CHNCH)Br2 by aminolysis, respectively. The tetrahedrally distorted square planar (τ4 ≅ 0.30) geometry and the singlet ground state of Ni in 4 were attributed to steric constraints of the CNC backb...
Source: Chemistry, an Asian Journal - April 15, 2024 Category: Chemistry Authors: Evangelos Papangelis Katrin Pelzer Christophe Gourlaouen Dominique Armspach Pierre Braunstein Andreas A Danopoulos Corinne Bailly Nikolaos Tsoureas Dimitrios Triantafyllos Gerokonstantis Source Type: research
A Concise Route to Keto-Bridged Polyphenols by Photo-Fries Rearrangement in Flow
Chem Asian J. 2024 Apr 15:e202400269. doi: 10.1002/asia.202400269. Online ahead of print.ABSTRACTDescribed is a new synthetic route to bis(2-hydroxy-3,5-di-t-butylphenyl)methanone and its derivatives. The combined esterification/photo-Fries rearrangement approach enables a modular preparation of keto-bridged polyphenols. This protecting group-free process is highly atom- and step-economic, and a scalable production was easily achieved in the continuous-flow mode.PMID:38619083 | DOI:10.1002/asia.202400269 (Source: Chemistry, an Asian Journal)
Source: Chemistry, an Asian Journal - April 15, 2024 Category: Chemistry Authors: Xin-Jie Lin Chien-Lung Wang Chi-How Peng Hsueh-Ju Liu Yen-Ku Wu Source Type: research
New Pyridine Dicarbene Ligands with Ring Expanded NHCs and their Nickel and Chromium Complexes
Chem Asian J. 2024 Apr 15:e202400169. doi: 10.1002/asia.202400169. Online ahead of print.ABSTRACTThe pincer complexes [NiIIBr(CNC)]Br (4), [CrIIIBr3(CNC)] (5a) and [CrIIIBr2.3Cl0.7(CNC)] (5b), where CNC = 3,3'-(pyridine-2,6-diyl)bis(1-mesityl-3,4,5,6-tetrahydropyrimidin-2-ylidene), were obtained from the novel ligand CNC, generated in situ from the precursor (CHNCH)Br2 and [NiIIBr2(PPh3)2] or from [CrII{N(SiMe3)2}2(THF)2] and (CHNCH)Br2 by aminolysis, respectively. The tetrahedrally distorted square planar (τ4 ≅ 0.30) geometry and the singlet ground state of Ni in 4 were attributed to steric constraints of the CNC backb...
Source: Chemistry, an Asian Journal - April 15, 2024 Category: Chemistry Authors: Evangelos Papangelis Katrin Pelzer Christophe Gourlaouen Dominique Armspach Pierre Braunstein Andreas A Danopoulos Corinne Bailly Nikolaos Tsoureas Dimitrios Triantafyllos Gerokonstantis Source Type: research
A Concise Route to Keto-Bridged Polyphenols by Photo-Fries Rearrangement in Flow
Chem Asian J. 2024 Apr 15:e202400269. doi: 10.1002/asia.202400269. Online ahead of print.ABSTRACTDescribed is a new synthetic route to bis(2-hydroxy-3,5-di-t-butylphenyl)methanone and its derivatives. The combined esterification/photo-Fries rearrangement approach enables a modular preparation of keto-bridged polyphenols. This protecting group-free process is highly atom- and step-economic, and a scalable production was easily achieved in the continuous-flow mode.PMID:38619083 | DOI:10.1002/asia.202400269 (Source: Chemistry, an Asian Journal)
Source: Chemistry, an Asian Journal - April 15, 2024 Category: Chemistry Authors: Xin-Jie Lin Chien-Lung Wang Chi-How Peng Hsueh-Ju Liu Yen-Ku Wu Source Type: research
Na/N Co-doped Seaweed Biochar Composite for Efficient Removal of Aqueous Pb(II) and Cu(II)
In this study, Sodium and nitrogen co-doped porous carbon material (Na/NABc) was successfully prepared from seaweed, sodium hydroxide, and dicyandiamide. The experimental results showed that Na/NABc is an excellent adsorbent for the effective removal of Pb(II) and Cu(II) from water bodies. Specifically, 99.8% of Pb(II) and 64.6% Cu(II) (100 mg/L) were removed within 12 h using 10 mg Na/NABc(10%) at 25 °C. The adsorption of Pb(II) and Cu(II) in aqueous solution by Na/NABc(10%) was efficient and rapid in the first stage. The theoretical maximum removal capacities of Na/NABc for Pb(II) and Cu(II) were 959.6 and 299.1 mg/g, r...
Source: Chemistry, an Asian Journal - April 12, 2024 Category: Chemistry Authors: Meiyuan Fu Qianhui Ma Yun Luo Wen Feng Xianghui Wang Source Type: research
Homogeneous and Heterogeneous Frustrated Lewis Pairs for the Activation and Transformation of CO2
Chem Asian J. 2024 Apr 12:e202400208. doi: 10.1002/asia.202400208. Online ahead of print.ABSTRACTDue to the serious ecological problems caused by the high CO2 content in the atmosphere, reducing atmospheric CO2 has attracted widespread attention from academia and governments. Among the many ways to mitigate CO2 concentration, the capture and comprehensive utilization of CO2 through chemical methods have obvious advantages, whose key is to develop suitable adsorbents and catalysts. Frustrated Lewis pairs (FLPs) are known to bind CO2 through the interaction between unquenched Lewis acid sites/Lewis base sites with the O/C of...
Source: Chemistry, an Asian Journal - April 12, 2024 Category: Chemistry Authors: Tao Du Peng Zhang Zhen Jiao Jiancheng Zhou Ding Yuxiao Source Type: research
