Ruthenium(II) diphosphine(phosphine)/imine/amine/CO complexes as efficient catalysts in transfer hydrogenation of ketones

Publication date: Available online 7 August 2018Source: Journal of Organometallic ChemistryAuthor(s): Sai Ge, Jin Zhang, Jianguo Zhao, Imran Ulhaq, Guibin Ma, Robert McDonaldAbstractTreatment of [RuCl2(CO)2]n with different phosphine ligands, four Ru(II) complexes of cis-, cis-, trans- RuCl2(CO)2L2 (L = PH(C6H11)2 (1), PPh3 (2), PPh2(C6F5) (3) and PMe3 (4)), in which 1 and 3 are novel complexes, have been generated in methyl chloride and isolated as pure compound in solid. In CH2Cl2 mixed 1:1 M ratio of RuCl2(PP3)3 and 1,1′-bis(diphenylphosphine)ferrocene (DPPF), and further reacted with quantitative 2-aminopyridine (ampy), 2-picolylamine (picam) and pyridine ligands, the complexes of RuCl2(DPPF) (ampy) (5), RuCl2(DPPF) (picam) (6) and RuCl2(DPPF) (Py)2 (7) were generated in situ and isolated in solid. All the complexes are fully characterized by multinuclear NMR (1H, 13C, 31P and 19F), element analysis and FTIR spectroscopies. Meanwhile, the single crystal structures of 1, 8 and 9 complexes were determined by X-ray crystallography. The observed IR and crystal data of 1–4 clearly indicate that different phosphine donor ligands occupying trans axis position of Ru(II)Cl2(CO)2 skeleton can affect the coordination carbonyl C-O bond distance (1.143 Å (1), 1.136 Å (4) and 1.131 Å (2)), and this interaction can be quantitatively detected by its FTIR vibration frequencies. The homogeneous hydrogenation transfer catalytic reactivity of so-synthesized complexes have ...
Source: Journal of Organometallic Chemistry - Category: Chemistry Source Type: research
More News: Chemistry | Chloride