bromide has been prepared; it isomerises readily in neutral or basic medium to the allenic isomer. Base-catalysed nucleophilic additions of carboxylic acids to the allenic salt occur readily and the adducts, which are activated vinyl esters, react rapidly with amines and alcohols to give amides and esters. In such reactions, the sulphonium salt can be prepared and used as an acylation catalyst in situ
制备了
溴化二甲基丙-2-炔基
溴化;;它容易在中性或碱性介质中异构化为烯丙基异构体。碱催化的
羧酸向烯丙基盐的亲核加成反应很容易发生,加合物(即活化的
乙烯基酯)与胺和醇快速反应,生成酰胺和酯。在这样的反应中,可以制备salt盐并将其用作原位的酰化催化剂。在某些条件下,the中心的脱烷基反应会发生酰化反应。