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。
Alexakis,A. et al., Bulletin de la Societe Chimique de France, 1977, p. 693 - 698
作者:Alexakis,A. et al.
DOI:——
日期:——
Regioselectivity in the addition of alkanethiols to vinylacetylene in superbasic media of alkali-metal hydroxides in dimethyl sulfoxide
作者:S. V. Amosova、G. K. Musorin、B. A. Trofimov、V. V. Keiko
DOI:10.1007/bf00953038
日期:1985.12
Regio- and Stereoselective Nucleophilic Addition of Thiols to Vinylacetylene
作者:R. H. Everhardus、R. Gräfing、L. Brandsma
DOI:10.1055/s-1983-30447
日期:——
Oida, Tatsuo; Tanimoto, Shigeo; Terao, Hiromu, Journal of the Chemical Society. Perkin transactions I, 1986, p. 1715 - 1726