Process for the manufacture of color formers of indoles and anhy

Details Process for the manufacture of color formers of indoles and anhy Process for the manufacture of color formers of indoles and anhy

1976-12-06

1978-07-25

Love, Ethel G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

106 145, 106 21, C07D20920

Patent

active

041028937

ABSTRACT:
A process for the manufacture of color formers comprising reaction of 2 moles of an indole in the presence of a condensation agent with about 1 mole of an anhydride of the formula ##STR1## wherein A is the residue of a benzene or naphthalene or of a heterocyclic ring, the new color formers obtained by reacting 2 moles of an indole with a halogen- or nitro-substituted phthalic anhydride, or the anhydride of a vicinal naphthalene pyridine or quinoline dicarboxylic acid, the new 3,3-bis-(indol-3-yl)-phthalides substituted at the nitrogen atom with aralkyl or alkyl with 6 to 18 carbon atoms or alkenyl radicals with 3 to 18 carbon atoms or substituted alkyl or alkylene groups with 1 to 18 and 3 to 18 carbon atoms respectively and pressure sensitive recording paper containing at least one of the new color formers.

REFERENCES:
patent: 3540913 (1970-11-01), Lin
patent: 3736337 (1973-05-01), Farber
patent: 3931228 (1976-01-01), Borror

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