Development restrainer release compounds

Details Development restrainer release compounds Development restrainer release compounds

1982-03-29

1984-04-10

Coughlan, Jr., Paul M.

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

Organic compounds

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

548251, 544276, 544296, C07D40306, C07D40312

Patent

active

044422903

ABSTRACT:
There are described novel compounds which are represented by the formula ##STR1## wherein R is ##STR2## A is sulfur or selenium; X represents the nonmetallic atoms necessary to form a nucleus which completes a five or six membered heterocyclic moiety; R.sub.1 is H or lower alkyl; R.sub.2 is H or a hydrolyzable group; and R.sub.3 is H, alkyl or a hydrolyzable group. The compounds are useful in photographic applications and provide controlled release of a photographically useful material during processing of photographic elements with an aqueous alkaline processing composition.

REFERENCES:
patent: 4350752 (1982-09-01), Reczek et al.
patent: 4355092 (1982-10-01), Mehta et al.
patent: 4355101 (1982-10-01), Mehta et al.
Guglielmi, Hoppe-Seyler's Z. Physiol. Chem., 349(12), pp. 1733-1738 (1968).

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