studied. The electronic effects of some commonly used protective groups associated with the N-heterocycles were also investigated for alkenes obtained in the context of the widely employed Wittig olefination reaction. It was observed that hetero-benzylic positions of the pyridine, thiophene and furan derivatives were stable after Wittig olefination. Similarly, electron-withdrawing groups (EWGs) attached to
已经研究了缺电子和富电子杂环在杂苄基位置的 Wittig 烯化。还研究了与N-杂环相关的一些常用保护基团的电子效应,用于在广泛使用的 Wittig 烯化反应中获得的烯烃。观察到
吡啶、
噻吩和
呋喃衍
生物的杂苄基位置在 Wittig 烯烃化后是稳定的。同样,连接到 N-杂环(
吲哚和
吡咯衍
生物)的吸电子基团 (EWG) 直接增强了 Wittig 烯化期间和之后苄基位置的稳定性,从而形成稳定的烯烃。相反,电子供体基团 (EDG) 相关的 N-杂环提高了苄基烯烃的反应性,导致烯化产物的产率降低或分解。