3,3-Disubstituted phthalides and naphthalides

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

1974-04-01

1977-01-04

Gotts, Lewis

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

26032612R, 96 29R, 96 29D, 96 66R, 96 76R, 96 77, 96 84R, C07D20918

Patent

active

040012778

ABSTRACT:
This invention relates to a class of 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 the 3,3-substituents is an indol-3-yl radical substituted with hydrogen on the heterocyclic N atom and the other of said 3,3 substituents is a p-hydroxycarbocyclic aryl radical selected from a 4'-hydroxy-1'-phenyl radical and a 4'-hydroxy-1'-naphthyl radical.

REFERENCES:
patent: 3540911 (1970-11-01), Lin
patent: 3829322 (1974-08-01), Ozutsumi et al.

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