Hofmann Elimination

概述

The Hofmann elimination converts a quaternary ammonium salt to an alkene, amine, and water upon heating with base. Unlike E2 elimination, Hofmann elimination favors the less substituted alkene (anti-Zaitsev). This reaction was historically used to determine amine structures by exhaustive methylation and elimination.

参与者

日常示例

Hofmann elimination was crucial in determining the structures of complex alkaloids like morphine and quinine before modern spectroscopy.

工业重要性

霍夫曼消除反应主要应用于确定有机分子中氮原子的位置（霍夫曼降解），通过识别消除产物来推断胺的结构，在天然生物碱（如吗啡、尼古丁）的结构鉴定工作中发挥了重要历史作用。现代合成中，霍夫曼消除用于合成末端烯烃（反马氏选择性）。