PH Sensitive dyes containing a phenolate group

Details PH Sensitive dyes containing a phenolate group PH Sensitive dyes containing a phenolate group

1975-08-28

1976-08-24

Gotts, Lewis

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

96 3, 96 29D, 96 84R, 26032612R, 26032614R, 2603434, C07D20914

Patent

active

039766594

ABSTRACT:
This invention relates to a new class of pH sensitive indicator dyes useful as optical filter agents in photographic processes to protect a selectively exposed photosensitive material from further exposure during processing in the presence of incident light. Such dyes contain a phenolate group as the ring-closing moiety and are represented by the compounds ##SPC1##
Wherein R is hydrogen, alkyl, aryl, aralkyl or alkaryl, R.sup.1 and R.sup.2 the same are hydrogen, chloro or nitro, and R.sup.3 is hydrogen, carboxy, sulfonamido, sulfamoyl, or alkoxy.

REFERENCES:
patent: 3509174 (1970-04-01), Lin

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