Photographic products and processes

Details Photographic products and processes Photographic products and processes

1985-04-29

1986-12-23

Gerstl, Robert

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546280, 548200, C07D27704, C07D27706

Patent

active

046313443

ABSTRACT:
Photographic products and processes for the imagewise generation of a dye from a color shifted dye precursor of a preformed image dye, said precursor having at least one ##STR1## group, wherein R is hydrogen, alkyl, provided that the .alpha.-carbon does not have a hydrogen atom attached thereto, aryl such as phenyl or substituted phenyl, e.g. p-nitrophenyl, or heterocyclic such as pyridine; R.sub.1 -R.sub.6 are hydrogen, alkyl, preferably having from 1 to 6 carbon atoms, or aryl; n is 0 or 1; and T is a moiety containing a thiazolidin-2-yl group which upon silver-assisted cleavage of said thiazolidin-2-yl group results in the formation of a ##STR2## group, which may be protonated under the reaction conditions, followed by cleavage of said ##STR3## which cleavage is anchimerically assisted or accelerated by said ##STR4## to provide after protonation, an ##STR5## group in a dye chromophore. In a preferred embodiment the precursor is a substantially colorless compound.

REFERENCES:
patent: 3719489 (1973-03-01), Cieciuch et al.
patent: 4098783 (1978-07-01), Cieciuch et al.
patent: 4468448 (1984-08-01), Rogers et al.
patent: 4468449 (1984-08-01), Arbree et al.
patent: 4468450 (1984-08-01), Meneghini et al.
patent: 4468451 (1984-08-01), Foley

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