Novel 4-aryl- or heteroaryl-2,6-bis(heteroaryl) or [(substituted-amino) phenyl] pyridines which are useful as color formers in pressure-sensitive carbonless duplicating systems and thermal marking systems are prepared by reacting an aryl or heteroaryl methyl ketone with an aryl or heteroaryl aldehyde in the presence of ammonia or an ammonia-releasing agent.
新型 4-芳基或杂芳基-2,6-双(杂芳基)或[(取代-
氨基)苯基]
吡啶可用作压敏无碳复写系统和热打标系统中的
显色剂,其制备方法是在
氨或
氨释放剂存在下,使芳基或杂芳基甲基酮与芳基或杂芳基醛反应。