Hydroxyquinoline cyan couplers and their process of production

摘要

8-hydroxyquinoline and 5-hydroxyquinoline compounds of the following formulae: <IMAGE> or <IMAGE> , wherein: R1 is a substituted or unsubstituted alkyl group with 8 to 30 carbon atoms; R2 is hydrogen or another substituent; X is a group capable of being released by a coupling reaction with an oxidized aromatic primary amine developing agent; and Z is a nonnucleophilic substituent or a group not capable of being eliminated during or following a coupling reaction with an oxidized color developer have been found to be useful in photographic materials as cyan dye-forming couplers. A process in which a substituted aminophenol salt reacts with two molar equivalents of an enolizable aldehyde containing at least two a-substituted hydrogen atoms is used to make these couplers and other hydroxyquinoline compounds.