Wagner-Meerwin rearrangement

WAGNER-MEERWIN REARRANGEMENT. Carbon-to-carbon migration of alkyl, aryl, or hydnde ions. The original example is the acid-catalyzed rearrangement of camphene hydrochloride lo isobornyl chloride. 

Early attempts to verify the stereochemical predictions of orbital symmetry control were hampered by carbocation rearrangement reactions/ such as Wagner-Meerwin shifts, although the very presence of these anomalous pathways is consistent with a cationic pathway. It is now well established that the Nazarov cyclization occurs via a pentadienyl cation 10,... 

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