alk-3-en-1-yltin compounds to form electron deficient carbon atoms γ to tin. These incipient carbonium ions the electrophilically induce heterolytic fragmentations of the carbon-tin σ bonds (electrophilic displacement of R3Sn+) with concurrent ring formation. Cyclopropylmethoxy derivatives were similarly obtained from thermal and Lewis acid catalyzed cyclodestannylation reactions of 3,4-epoxybutyltri-n-butyltin.
通过烷基-3-烯丙基
锡化合物的环去
锡烷基化反应,已经制备了各种环丙基羰基化合物。认为环脱
锡反应的初始阶段包括将亲电子试剂加到alk-3-en-1-yltin化合物的双键上,从而形成
锡的电子不足的碳原子γ。这些初期的碳离子通过亲电方式诱导碳-
锡σ键的杂溶裂解(R 3 Sn +的亲电置换)并同时形成环。环丙基甲氧基衍
生物类似地从3,4-环氧丁基三正
丁基锡的热和
路易斯酸催化的环脱
锡反应中获得。