| 摘要 |
An azomethine compound of the general formula <IMAGE> (1) wherein A and B, independently of the other, represent naphthylene or phenylene which are unsubstituted or substituted by halogen, cyano, nitro, lower alkyl, lower alkoxy, benzyloxy or phenoxy, X represents a group of the formula <IMAGE> R1 and Y1 each represents alkyl of at most 12 carbon atoms which is unsubstituted or substituted by halogen, hydroxyl, cyano, lower alkoxy or lower alkyl-carbonyloxy; cycloalkyl, phenyl, benzyl or phenyl or benzyl which are substituted by halogen, nitro, lower alkyl or lower alkoxy, R2 and Y2 each represents hydrogen, alkyl of at most 12 carbon atoms which is unsubstituted or substituted by halogen, hydroxyl, cyano, lower alkoxy or lower alkyl-carbonyloxy; cycloalkyl, benzyl or benzyl which is substituted by halogen, nitro, lower alkyl or lower alkoxy or each pair of substituents R1and R2 or Y1 and Y2, together with the nitrogen atom to which they are attached, independently represents a 5- or 6-membered heterocyclic radical, Q represents -CO- or -SO2- and the benzene ring D is unsubstituted or substituted by halogen, nitro, lower alkyl or lower alkoxy; these compounds are particularly useful as color formers which give intense yellow or orange shades of excellent light fastness when they are brought into contact with an electron-accepting coreactant.
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