Facteurs stériques influençant la transposition de Wagner-Meerwein des carbocations de type pinanyle

Steric factors influencing Wagner-Meerwein rearrangement of pinanyl carboniumions. The course of the Wagner-Meerwein rearrangement of ions obtained by protonation of substituted α- or β-pinenes is strongly dependent on the configuration of the substituents. The situation is complicated by the possibility of double bond isomerisation (α-→β-pinenes) before rearrangement. Simple rules for predicting the products are given.