Vy. Sosnovskikh, CONDENSATION OF NITRILES OF POLYHALOGENATED CARBOXYLIC-ACIDS AND BENZONITRILE WITH 2-HYDROXY-4,6-DIMETHYLACETOPHENONE, Russian chemical bulletin, 47(2), 1998, pp. 354-356
Condensation of 2-hydroxy-4,6-dimethylacetophenone with trifluoro-and
trichloro-acetonitriles gives 2-amino-5,7-dimethyl-2-trifluoro (trichl
oro) methyl-4-chromanones. The condensation with 2,2,3,3-tetrafluoropr
opionitrile, perfluorovaleronitrile, and benzonitrile stops at the sta
ge of formation of the corresponding enamines.