2-Amino-2′-hydroxybenzophenones 3 have been synthesized by acylation of phenols with 2-isocyanatobenzoyl chloride 2 in the presence of aluminium trichloride. The ring-chain tautomerism of the reagent 2 promoted by Lewis acid has been established on the basis of a crystal structure analysis of the 1:1 complex formed by 2 and aluminium trichloride.
F. Bigi, G. Sartori, R. Maggi, C. Valerio-Papa, E. Marzi, M. Lanfranchi and M. A. Pellinghelli, J. Chem. Soc., Perkin Trans. 1, 1996, 1815 DOI: 10.1039/P19960001815
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