Photographic silver halide material containing 2-equivalent yell

Details Photographic silver halide material containing 2-equivalent yell Photographic silver halide material containing 2-equivalent yell

1975-08-13

1977-09-20

Brown, J. Travis

Gas separation: apparatus

Electric field separation apparatus

Collecting electrode details

96 565, 260562R, G03C 140

Patent

active

040494586

ABSTRACT:
Desirable 2-equivalent yellow couplers carry at the coupling position a monocyclic pyrrole, diazole or triazole ring attached to the coupling position of the yellow coupler by a nitrogen atom, which ring can be split off in the coupling reaction.
Photographic 2-equivalent yellow couplers with nitrogen-containing heterocyclic splittable groups having such nitrogen bonded to the coupling position of the couplers, are prepared by reacting a corresponding 2-equivalent yellow coupler containing a halogen such as chlorine in the coupling position with the nitrogen-containing heterocyclic compound that supplies the splittable group, in the presence of base and in the further presence of hexamethylphosphoric acid triamide as solvent.

REFERENCES:
patent: 3617291 (1971-11-01), Sawdey
patent: 3770436 (1973-11-01), Fujiwhara et al.
patent: 3808945 (1974-05-01), Matsuo et al.

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