61433-48-5Relevant academic research and scientific papers
Benzoindole phthalides
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, (2008/06/13)
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.
