Cobalt (II) Chloride Catalysed Regioselective Cleavage of Oxiranes with Chlorotrimethylsilane
作者:Javed Iqbal、Mohd. Amin Khan
DOI:10.1246/cl.1988.1157
日期:1988.7.5
Oxiranes can be cleaved regioselectively with chlorotrimethysilane in presence of cobalt(II) chloride to the corresponding O-silylated vicinal chlorohydrins in excellent yields.
13C-NMR shows that the regiochemistry of the reaction of a halosilane Me3SiX (X = Cl, Br) on a dissymetric epoxide R-CH-CH2O depends of R : R-CHX-CH2OSiMe3 [, R = 2-Fu, Ph) or R-CHOSiMe3-CH2X (, R = Et, > ).
1,2-Ferrocenediylazaphosphinines2: A New Class of Nucleophilic Catalysts for Ring-Opening of Epoxides
作者:Tae-Jeong Kim、Seung Hwan Paek、Sang Chul Shim、Chan Sik Cho
DOI:10.1055/s-2003-38758
日期:——
1,2-Ferrocenediylazaphosphinines (1a-c) have been successfully employed as a new class of nucleophilic catalysts for ring-opening of a range of epoxides, their catalytic efficiency in terms of regioselectivity as well as chemical yield comparing well with the existing catalysts in the literature. In contrast, low enantiomeric excesses have been obtained from the reactions of meso-epoxides catalyzed by (R)-1.