Photographic products and processes

Details Photographic products and processes Photographic products and processes

1984-07-23

1986-05-27

Hoke, Veronica P.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548200, 548201, C07D27704

Patent

active

045916462

ABSTRACT:
This invention relates to photographic processes and products for forming an image in dye from a colorless precursor of a preformed image dye which is substituted with a moiety containing a thiazolidinyl group, said thiazolidinyl group (a) being capable of undergoing cleavage imagewise in the presence of an imagewise distribution of silver ion and/or soluble silver complex and (b) possessing a substituent on the carbon atom in the 2-position which upon cleavage of said thiazolidinyl group, undergoes a .beta.-elimination reaction followed by an intramolecularly accelerated nucleophilic displacement reaction, which moiety maintains the precursor in its colorless form at least until said thiazolidinyl group undergoes said cleavage. In a further embodiment, this sequence of reactions is used to release an imagewise distribution of a photographically useful reagent which reagent may be, for example, a photographically active reagent.

REFERENCES:
patent: 3443941 (1969-05-01), Rogers
patent: 3719488 (1973-03-01), Locatelli et al.
patent: 3719489 (1973-03-01), Cieciuchi et al.
patent: 4098783 (1978-07-01), Cieciuchi et al.
patent: 4248962 (1981-02-01), Lau
patent: 4358525 (1982-11-01), Mooberry et al.
patent: 4468448 (1984-08-01), Rogers

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