Benzoindole phthalides

Details Benzoindole phthalides Benzoindole phthalides

C - Chemistry, Metallurgy

09

B

260/306.05, 260/

C09B 57/00 (2006.01) C07D 307/89 (2006.01) C07D 491/04 (2006.01)

Patent

CA 1055943

Abstract of the Disclosure A chromogenic compound of normally colorless form is disclosed having the following structural formula: Image 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 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. -1-

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