The Mechanism of Fries Rearrangement and Acylation Reaction in Polyphosphoric Acid were studied...

P2O5 /H3PO4 (PPA) was found to be an efficient new reagent for probing the mechanism of acylation reactions and Fries rearrangement of acyloxy benzene derivatives and also the direct acylation reactions of phenol derivatives with Carboxylic acids...