Benzoindole phthalides

Details Benzoindole phthalides Benzoindole phthalides

1975-04-10

1977-04-05

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260250BC, 260295T, C07D40504

Patent

active

040161749

ABSTRACT:
A chromogenic compound of normally colorless form is disclosed having the following structural formula: ##STR1## wherein A can be aminophenyl, indolyl, and benzoindolyl, substituted or not;
B can be benzoindolyl, substituted or not; and E can be a broad family of aromatic and heterocyclic structures. The compound is eligible for use in pressure-sensitive record materials and manifold marking systems. Because of light absorption characteristics, selected compounds of this invention are especially useful where broad spectrum absorption and machine readability are important.

REFERENCES:
patent: 3736337 (1973-05-01), Farber

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