Vinyl type carbocations ArC+=CHX [X = CO2H, CO2Alk, C≡N, P(O)(OAlk)2] generated from alkyl 3-arylpropynoates and related compounds in fluorosulfonic acid at −75 to −20°C react with various benzene derivatives, following the mechanism of electrophilic substitution of hydrogen. A new procedure for the synthesis of alkyl 3,3-diarylpropenoates having various substituents in the aryl fragments has been developed on the basis of protonation of the triple bond in alkyl 3-arylpropynoates.
由烷基3-芳基
丙炔酸酯及相关化合物在
氟磺酸中于−75至−20°C生成的
乙烯基类型的碳正离子ArC+=CHX [X = CO2H, CO2Alk, C≡N, P(O)(OAlk)2],与各种苯衍
生物反应,遵循氢的电亲体取代机制。基于烷基3-芳基
丙炔酸酯中三键的质子化,开发了一种合成具有不同芳基片段取代基的烷基3,3-二芳基
丙烯酸酯的新方法。