3,3-Disubstituted phthalides and naphthalides

Details 3,3-Disubstituted phthalides and naphthalides 3,3-Disubstituted phthalides and naphthalides

1974-04-26

1976-01-20

Winters, Sherman D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D20986

Patent

active

039338495

ABSTRACT:
This invention relates to a class of phthalein 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 comprise 3,3-disubstituted phthalides and 3,3-disubstituted naphthalides wherein one of said 3,3 substituents is a carbazol-3-yl radical and the other is an indol-3-yl radical possessing a hydrogen-bonding group substituted on a carbon atom adjacent to the heterocyclic N atom, both of said carbazolyl and indolyl radicals having hydrogen substituted on the heterocyclic N atom.

REFERENCES:
patent: 3491111 (1970-01-01), Lin
patent: 3647437 (1972-03-01), Land
patent: 3702244 (1972-11-01), Bloom et al.

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