Process for the preparation of binary sensitizing dyes

Details Process for the preparation of binary sensitizing dyes Process for the preparation of binary sensitizing dyes

1992-04-08

1998-05-26

Higel, Floyd D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

544301, 544302, 548159, 5483054, 5483057, 548461, 549284, C07D40100, C07D40300, C07D41700, C07D23504, C07D23520, C07D209148

Patent

active

057567409

ABSTRACT:
A process for the preparation of photographic binary sensitizing dyes, which comprise two separate, nonconjugated chromophores, one of which has the capability of adsorbing to a silver halide grain surface, the other of which is substantially non-adsorbing to silver halide. The process comprises reacting two dye compounds in a solvent in the presence of a 2-halo-1-alkylpyridinium salt and a 4-dialkylaminopyridine.

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