Substituted 3,3-diphenylphthalides, useful as color precursors, particularly in the art of pressure-sensitive duplicating systems and heat-sensitive marking systems, are prepared by condensing substituted 2-benzoylbenzoic acids with substituted anilines.
制备用于颜色前体的3,3-二苯基邻苯二酸酐,特别适用于压敏复制系统和热敏标记系统的艺术,通过将取代的2-苯甲酰基
苯甲酸与取代的
苯胺缩合而成。