The Hayashi rearrangement is the chemical reaction of ortho-benzoylbenzoic acids catalyzed by sulfuric acid or phosphorus pentoxide. ; p. 1520 ; p. 1524
This reaction proceeds through electrophilic acylium ion attack with a spiro intermediate.The Hayashi Rearrangement of Substituted o-Benzoylbenzoic Acids Reuben B. Sandin, Russell Melby, Robert Crawford, and Donald McGreer J. Am. Chem. Soc. 1956 pp 3817 - 3819; Name Reactions: A Collection of Detailed Reaction Mechanisms By Jie Jack Li Published 2003 Springer
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