A review of recent applications of the Claisen rearrangement to the synthesis of organic compounds is presented. An emphasis has been placed on the development of new reagents and on the more imaginative uses of the reaction in synthesis. 1. Introduction 2. Allyl Vinyl Ether Claisen Rearrangements 2.1 Ether Exchange, Acetal-Enol Ether Formation 2.2 Amide Acetals 2.3 Ortho Esters 2.4 Miscellaneous Claisen Rearrangements 3. Allyl Ester Enolate Rearrangements 4. Nitrogen Claisen Rearrangements 5. Sulfur Claisen Rearrangements 6. Reagents Containing -C≡N- or -C≡C-Triple Bonds 7. Polyhetero Claisen Rearrangements 8. Catalysis of the Claisen Rearrangement