The reactions of phenols with α, β-unsaturated aromatic acids in presence of polyphosphoric acid: Synthetic and mechanistic studies

PL Majumder, S Chatterjee Lahiri…

Index: Majumder; Chatterjee; Mukhoti Journal of the Indian Chemical Society, 2001 , vol. 78, # 10-12 p. 743 - 755

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Citation Number: 10

Abstract

Résumé/Abstract The reactions of cinnamic acid with phenol itself, catechol, hydroquinone, pyrogallol and 2-naphthol in presence PPA were studied and that with resorcinol was reinvestigated. With phenol itself and hydroquinone were obtained 3, 4-dihydro-4- phenylcoumarin (1r) and 6-hydroxy-3, 4-dihydro-4-phenylcoumarin (Is), respectively, as the sole products. Catechol and pyrogallol, on the other hand, afforded, besides the ...