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Claisen rearrangement[′klā·sən ‚rē·ə′rānj·mənt]
the migration of an allyl or substituted allyl group in allyl ethers of phenols (1) or enols (2) with the formation, respectively, of ortho-allyl phenols or C-allyl derivatives of keto-enols:
The Claisen rearrangement is widely used in organic synthesis, in particular for the synthesis of natural compounds.
The rearrangement was discovered by the German chemist L. Claisen in 1912.