Alkene Synthesis Using Phosphonium Ylides as Umpolung Reagents

Abstract

Abstract We report a transformation between a well‐known nucleophile, phosphonium ylide, and an electrophile. Subsequent ylide‐ylide coupling achieves unusual ( Z )‐selectivity as compared to the conventional Wittig olefination. The synthesis of medium‐sized ring olefins has also been demonstrated, together with a one‐pot olefination from activated halides.