| abstract |
PURPOSE: Quinophthalone compds. of formula I [wherein rings A and B may be substd. by halogen(s), lower alkyl, alkoxy, or phenyl radials; X represents phenylene or naphthylene ring with two carbonyl groups attached to ortho or peri-position, which may be substd. by nonionizable substituent(s); and rings Y and Z may be substd. by halogen(s)], capable of forming tatomeric structure of formula I or II. n COPYRIGHT: (C)1976,JPO&Japio |