Ortho-carboxyphenyl azo ortho-hydroxypyrazole yellow dyes having silver halide developing capability
AssigneePolaroid Corporation
InventorElbert M. Idelson
Life of this patent
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Abstract
Novel yellow ortho carboxy, ortho' hydroxy azo dyes having a silver halide developing capability and conforming to the formula: ##STR1## where X' is hydrogen, hydroxy, carboxy or any substituent that does not adversely affect the solubility of thecompound of said formula in an aqueous alkaline photographic processing composition and does not render the oxidized form of the compound of said formula mobile in such processing composition; R.sup.5 is hydrogen, hydroxyl, alkyl having from 1-6 carbon atoms or ##STR2## having from 1-6 carbon atoms); R.sup.6 is hydrogen or alkyl; each R.sup.7 is hydrogen or a protective group which can be removed to provide a dihydroxyphenyl silver halide developing substituent and --alkylene-- has from 1-6 carbon atoms.
Claims14
A compound of the formula:
- ##STR23## where X' is hydrogen, hydroxy, carboxy or any substituent that that does not adversely affect the solubility of the compound of said formula in an aqueous alkaline photographic processing composition and does not render the oxidized form of the compound of said formula mobile in such processing composition;
- R.sup.5 is hydrogen, hydroxyl, alkyl having from 1-6 carbon atoms or ##STR24## having from 1-6 carbon atoms);
- R.sup.6 is hydrogen or alkyl;
- each R.sup.7 is hydrogen or a protective group which can be removed to provide a dihydroxyphenyl silver halide developing substituent and--alkylene--has from 1-6 carbon atoms.
A compound of the formula:
- ##STR26## where R.sup.5 is hydrogen, hydroxyl, alkyl having from 1-6 carbon atoms or ##STR27## having from 1-6 carbon atoms);
- R.sup.6 is hydrogen or alkyl;
- each R.sup.7 is hydrogen or a protective group which can be removed to provide the dihydroxyl phenyl substituent and--alkylene--has from 0-6 carbon atoms.
A compound of the formula:
- ##STR28## R.sup.6 is hydrogen or alkyl;--alkylene--has from 0-6 carbon atoms and each R.sup.7 is hydrogen --CH.sub.3, --CO.sub.2 CH.sub.3 or --CO.sub.2 C.sub.2 H.sub.5.
Dependencies are inferred from the claim text.