作者:G. Jenner
DOI:10.1016/s0040-4020(02)00347-2
日期:2002.5
The pressure effect on the phosphine-catalyzed nucleophilic addition of alcohols to unsaturated nitriles is examined. As a general result, pressure promotes these reactions. Their sensitivity to pressure increases with increasing steric congestion of either the alcohol or the nitrile. Activation volumes are found to be very negative pointing not only to a late transition state, but essentially to a
考察了对膦向不饱和腈的膦催化的亲核加成反应的压力影响。通常,压力会促进这些反应。它们对压力的敏感性随着酒精或腈的空间拥塞的增加而增加。发现活化体积是非常负的,不仅指向晚期转变状态,而且还取决于取决于电离的空间位阻,基本上指向相当大的电致伸缩贡献。这意味着压力有利于碳负离子的形成和腈的侵蚀。该结果突出了高压的合成效用,以消除空间抑制作用。