Adams; Fogler; Kreger, Journal of the American Chemical Society, 1922, vol. 44, p. 1131
作者:Adams、Fogler、Kreger
DOI:——
日期:——
Reductive Openings of Acetals: Explanation of Regioselectivity in Borane Reductions by Mechanistic Studies
作者:Richard Johnsson、Dan Olsson、Ulf Ellervik
DOI:10.1021/jo800396g
日期:2008.7.1
The mechanisms of regioselectivereductiveopenings of acetals were investigated in several model systems by a combination of Hammett plots, kinetic experiments, density functional calculations, and 11B NMR. The regioselectivity of borane reductions of cyclic acetals can be controlled by the choice of borane. Lewis acid activation of BH3·NMe3 increases the reaction rate and renders the borane the most
通过结合Hammett图,动力学实验,密度泛函计算和11 B NMR ,在几种模型系统中研究了缩醛的区域选择性还原开口的机理。可以通过选择硼烷来控制环缩醛的硼烷还原的区域选择性。BH 3 ·NMe 3的路易斯酸活化作用提高了反应速率,并使硼烷成为最具亲电性的物种,这与乙缩醛中电子含量更高的氧相关。相反,没有活化,而是由路易斯酸指导区域选择性,如与BH 3 ·THF反应所例示的。