Synthesis and Applications of (Pyridyl)imine Fe(II) Complexes as Catalysts in Transfer Hydrogenation of Ketones
作者:Robert T. Kumah、Paranthaman Vijayan、Stephen O. Ojwach
DOI:10.1007/s10562-020-03311-y
日期:2021.2
solid-state structure of complex Fe4 showed that the Fe atom contains three units of bidentate bound ligand L4 to form a six-coordinate cationic compound. The Fe(II) complexes were evaluated as catalysts in asymmetric transfer hydrogenation of ketones reactions and showed moderate catalytic activities with low enantioselectivity. Catalytic activities of the respective complexes were regulated by the nature
Structural elucidation of chiral (imino)pyridine/phosphine palladium(II) complexes and their applications as catalysts in methoxycarbonylation of styrene
作者:Nondumiso L. Ngcobo、Saphan O. Akiri、Aloice O. Ogweno、Stephen O. Ojwach
DOI:10.1016/j.poly.2021.115243
日期:2021.7
the complexes established N^N and N^P bidentate coordination mode of the ligands to give distorted square planar geometries. Complexes 1–6 displayed moderate catalytic activities in the methoxycarbonylation of styrene, to give predominantly branched esters of up to 95%. NMR spectroscopy studies pointed to possible decomposition of the active species, via ligand dissociation.
Structural, kinetics and mechanistic studies of transfer hydrogenation of ketones catalyzed by chiral (pyridyl)imine nickel(<scp>ii</scp>) complexes
作者:Robert T. Kumah、Nokwanda Tsaulwayo、Bheki A. Xulu、Stephen O. Ojwach
DOI:10.1039/c9dt00024k
日期:——
moments, elemental analysis and single crystal X-ray crystallography. The dinuclear dibromide nickel complexes dissociate into mononuclear species in the presence of strongly coordinating solvents. Compounds Ni1–Ni5 displayed moderate catalytic activities in the asymmetric transferhydrogenation (ATH) of ketones, but with low enantiomeric excess (ee%). Both mercury and substoichiometric poisoning tests pointed
Co(CO)3(NO) by opticallyactive unsymmetrical bidentateligands LL∗ yields pairs of diastereomers Co(CO)(NO)(LL∗), which differ only in the configuration at the Co atom. LL∗ can be a bisphosphane, trisphosphane, phosphaneimine or pyridineimine. For the complexes 2 the diastereomer ratios of 45:55 (2a:2b), 83:17 (3a:3b) and 63:37 (4a:4b) respectively indicate an optical induction from the ligand to the metal
Aminophosphinic Acids in a Pyridine Series, Part 2: Synthesis of 2-, 3-, and 4-Pyridyl Derivatives of 1-(Benzylamino)-methyl-H-phosphinic Acids
作者:Waldemar Goldeman、Bogdan Boduszek
DOI:10.1080/10426500902947666
日期:2009.6.23
1-[N-(benzyl)amino]-methyl-H-phosphinic acid were prepared by the addition of bis(trimethylsilyl)phosphonite to the corresponding imines and subsequent methanolysis of the addition products. Treatment of the 2-pyridyl- and 1-(4-pyridyl)-1-(benzylamino)-methyl-H-phosphinic acids with aqueous mineral acids leads to cleavage and formation of the corresponding secondary amines and phosphorous acid (H 3 PO 3 ).
1-[N-(苄基)氨基]-甲基-H-次膦酸的新2-吡啶基、3-吡啶基和4-吡啶基衍生物是通过将双(三甲基甲硅烷基)亚膦酸酯加入相应的亚胺中并随后进行甲醇分解来制备的加成产物。用无机酸水溶液处理 2-吡啶基-和 1-(4-吡啶基)-1-(苄氨基)-甲基-H-次膦酸导致裂解并形成相应的仲胺和亚磷酸 (H 3 PO 3 )。