Some aliphatic diphosphonic tetrachlorides. Part II. Some reactions of diphosphonic tetrachlorides
作者:Gennady M. Kosolapoff、Alfred D. Brown
DOI:10.1039/j39670001789
日期:——
Aliphaticdiphosphonictetrachlorides and Grignard reagents containing aryl groups readily gave diphosphine dioxides, of which several are described. In a similar reaction of the tetrachlorides with Grignard reagents containing branched alkyl groups the products were not the expected diphosphine dioxides, but the products of mono-substitution at each phosphorus atom accompanied by a reduction. A similar
Evaluation of bifunctional chiral phosphine oxide catalysts for the asymmetric hydrosilylation of ketimines
作者:Christopher J.A. Warner、Sian S. Berry、Simon Jones
DOI:10.1016/j.tet.2019.130733
日期:2019.12
A series of bifunctional phosphine oxides have been prepared and evaluated as catalysts for the trichlorosilane mediated asymmetrichydrosilylation of ketimines. bis-Phosphine oxides, hydroxy-phosphine oxides, and biaryl phosphine oxides all demonstrated good catalytic activity, but poor to moderate enantioselectivity. A bis-P-chiral phosphine oxide displayed the highest enantioselectivity of 60%.
已经制备了一系列双官能氧化膦,并评价了其为三氯硅烷介导的酮亚胺的不对称氢化硅烷化的催化剂。双膦氧化物,羟基膦氧化物和联芳基膦氧化物都表现出良好的催化活性,但是对映选择性差至中等。甲双- P -手性膦氧化物显示的60%的最高的对映选择性。