发明授权
US4351768A 2-[(3-Indolyl)carbonyl]-4/5-carboxybenzoic acids 失效
2 - [(3-吲哚基)羰基] -4 / 5-羧基苯甲酸

2-[(3-Indolyl)carbonyl]-4/5-carboxybenzoic acids
摘要:
3-Aryl-3-indolylphthalides, 3-aryl-3-pyrrolylphthalides and 3-aryl-3-carbazolylphthalides prepared by interaction of the appropriate 2-(heteroaryl)carbonylbenzoic acid and the appropriate phenylamine, and 3,3-bis(indolyl)phthalides prepared by the interaction of the appropriate 2-(indolyl)carbonylbenzoic acid and the appropriate indole are useful as color formers in pressure-sensitive carbonless duplicating systems, thermal marking systems and hectographic copying systems.
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