Given are experimental data indicating that base-catalyzed intramolecular cyclization of ammonium salts containing a 2-propynyl-like group together with a 3-alkenyl- or 3-aryl-2-propynyl group follows a concerted mechanism involving the 3-alkenyl- or 3-aryl-2-propynyl moiety as π4-fragment.
给出了实验证据,表明含有2-
丙炔基团的
铵盐的碱催化分子内环化反应,以及含有3-烯丙基或3-芳基-2-
丙炔基团的反应,遵循一种协同机制,其中3-烯丙基或3-芳基-2-
丙炔基团作为π4片段参与反应。