F. Bigi et al., ALUMINUM CHLORIDE-CENTER-DOT-2-ISOCYANATOBENZOYL CHLORIDE COMPLEX - CRYSTAL-STRUCTURE AND REACTIVITY, Journal of the Chemical Society. Perkin transactions. I, (15), 1996, pp. 1815-1818
2-Amino-2'-hydroxybenzophenones 3 have been synthesized by acylation o
f phenols with 2-isocyanato-benzoyl chloride 2 in the presence of alum
inium trichloride, The ring-chain tautomerism of the reagent 2 promote
d by Lewis acid has been established on the basis of a crystal structu
re analysis of the 1:1 complex formed by 2 and aluminium trichloride.