La 反应 de Diels-Alder de thioaldehydes avec le cyclopentadiene produitpreferentiellement l'isomere end。La selectivite la plus elevee est obtenue avec les 硫醛 RCHS ou Rest un groupe 烷基化 tel que t-丁基 ou 异丙基
Generation of thioaldehydes from sodium thiosulphate S-esters (Bunte salts)
作者:Gordon W. Kirby、Alistair W. Lochead、Gary N. Sheldrake
DOI:10.1039/c39840000922
日期:——
Treatment of Buntesalts, ZCH2SSO3Na where Z is an electron-withdrawing group, with triethylamine and calcium chloride in the presence of cyclopentadiene or 2,3-dimethylbuta-1,3-diene gives the corresponding cycloadducts of the transient thioaldehydes, ZCHS; the cyclopentadiene adducts dissociate upon heating thereby allowing transfer of the thioldehydes to dimethylbutadiene.