作者:J.P. Gouesnard
DOI:10.1016/s0040-4020(01)97562-3
日期:1974.1
conjugated dienes undergo 1,2 and 1,4 cycloaddition to diphenylketene to give cyclobutanones and dihydropyrans by a two-step ionic process. The electron delocalization of ketenophiles plays a prominent part in the mechanism but it is difficult to show a quantitative relation between second order rate constants and electronic distribution computed by the CNDO/2 method. The Z and E isomers of dienes give different
通过两步离子过程,功能共轭二烯经过1,2和1,4环加成成二苯乙烯酮,得到环丁酮和二氢吡喃。酮基亲电子的电子离域作用在该机理中起着重要作用,但是很难显示二阶速率常数与通过CNDO / 2方法计算出的电子分布之间的定量关系。二烯的Z和E异构体给出不同的加合物,速率常数比k E / k Z与过渡态稳定有关。