Grignard allylic substitution reaction catalyzed by 1,2,3-triazol-5-ylidene magnesium complexes

The SN2′-selective Grignard-allylic substitution reactions were effectively catalyzed by 1,2,3-triazol-5-ylidene magnesium complexes generated in situ from 1,3,4-trisubstituted 1,2,3-triazolium salts and the Grignard reagent.