Wagner–Meerwein Rearrangements

Since the initial studies by Wagner at the turn of the century, the Wagner–Meerwein rearrangement has been the subject of almost continuous investigation.¹ The reaction was initially examined in terms of the rearrangement of α-pinene (1) to bornyl chloride (2; Scheme 1), and of camphene (3) via camphene hydrochloride (4) to isobornyl chloride (5).