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。
Reglier, M.; Julia, S. A., Bulletin de la Societe Chimique de France, 1990, # 2, p. 226 - 235
作者:Reglier, M.、Julia, S. A.
DOI:——
日期:——
Stereospecific cyclisations of substituted α′-lithiatedα(Z), γ-butadienyl sulfoxides
作者:Marius Reglier、Sylvestre A. Julia
DOI:10.1016/s0040-4039(00)98128-0
日期:1985.1
REGLIER, M.;JULIA, S. A., BULL. SOC. CHIM. FR.,(1990) N, C. 226-235
作者:REGLIER, M.、JULIA, S. A.
DOI:——
日期:——
REGLIER, M.;RUEL, O.;LORNE, R.;JULIA, S. A., SYNTHESIS, BRD, 1983, N 8, 624-628