2,4-Dichloro-3-alkyl-6-nitrophenols which are useful as intermediate of cyan couplers in color photography are prepared by sulfonating 4-chloro-3-alkyl-phenols to obtain 5-chloro-4-alkylhydroxybenzenesulfonic acids, chlorinating the acids in an aqueous phase to obtain 3,5-dichloro-4-alkyl-2-hydroxybenzenesulfonic acids and nitrating the sulfonic acids.
2,4-二
氯-3-烷基-6-
硝基苯酚可用作彩色摄影中青色耦合剂的中间体,其制备方法是将 4-
氯-3-烷基
酚磺化,得到 5-
氯-4-烷基羟基
苯磺酸,在
水相中
氯化得到 3,5-二
氯-4-烷基-
2-羟基苯磺酸,再将
磺酸硝化。