空气稳定的不对称乙硅烷Me 3 Si-SiMe 2 [ o CON(i Pr)2 C 6 H 4 ]已开发用于炔烃的双硅烷化反应。该试剂可耐受多种官能团,可提供高收率的Z乙烯基乙硅烷。有人建议苯环束缚的酰胺基团将Pd 0氧化加成到Si-Si键中,这可能有助于形成六元Pd循环,从而产生具有良好或极好的区域选择性的产物。
(thermodynamic control) should be abandoned, or at least seriously amended: kinetic factors appear to exert a primary influence on the regioselectivity of such reactions. Since the two major kinetic factors (i.e., electrophilic character of and steric hindrance at a given silicon atom) have opposite effects on the orientation of the reaction, it may happen that kinetic and thermodynamic control lead to the
Peculiarities in the cleavage by methyllithium of unsymmetrical disilanes
作者:L. Hevesi、M. Dehon
DOI:10.1016/0040-4039(94)80041-3
日期:1994.10
The title reactions did not produce the more stable silyl anions from the disilanes studied, they either occurred by attack at the more electrophilic silicon atom, or led to unexpected products.