A mechanism proposed for the rearrangement of (+)-2-methylenebornane (8) to a mixture of (+)-4-methylisobornyl acetate (5) and its enantiomer (ent-5) is supported by evidence obtained by investigating the rearrangement of deuterated 2-methylenebornane. Key words: 4-methylcamphor, Wagner-Meerwein rearrangement, 6, 2-hydride shift, 9-bromo-4- bromomethylcamphor.