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.
3-芳基-3-
吲哚基邻苯二酸酐,3-芳基-3-
吡咯基邻苯二酸酐和3-芳基-3-
咔唑基邻苯二酸酐通过适当的2-(杂环芳基)羰基
苯甲酸与适当的
苯胺相互作用制备,而3,3-双(
吲哚基)-邻苯二酸酐则通过适当的2-(
吲哚基)羰基
苯甲酸与适当的
吲哚相互作用制备,它们在压敏无碳复写系统、热标记系统和蝕刻复印系统中作为
显色剂是有用的。