Bis-indolyl phthalides and naphthalides

Details Bis-indolyl phthalides and naphthalides Bis-indolyl phthalides and naphthalides

1973-10-23

1978-11-07

Love, Ethel G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

96 50PL, 26032614R, 26032615, C07D20904, C07D20920, C07D20914

Patent

active

041245920

ABSTRACT:
This invention relates to indole phthalein indicator dyes including phthalides and naphthalides wherein one of the indol-3-yl radicals is substituted with a hydrogen-bonding group on a carbon atom adjacent to the nitrogen atom of the indole ring. In a preferred embodiment, one of the indol-3-yl radicals is substituted with a hydrogen-bonding group and the other indol-3-yl radical is substituted with a hydrogen-bonding group or with an electron-withdrawing group. These indicator dyes, especially those of the preferred embodiment, possess a relatively high pKa and a relatively broad absorption spectrum in the visible range.

REFERENCES:
patent: 3509173 (1970-04-01), Lin
patent: 3509174 (1970-04-01), Lin
patent: 3862128 (1975-01-01), Greenwald

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