公开(公告)号：US5136109A

公开(公告)日：1992-08-04

申请号：US707097

申请日：1991-05-29

申请人： Osamu Kimura ,  Yasuhiko Horikawa ,  Masaya Yamashita ,  Kazutaka Morino ,  Shinichi Koyama

发明人： Osamu Kimura ,  Yasuhiko Horikawa ,  Masaya Yamashita ,  Kazutaka Morino ,  Shinichi Koyama

IPC分类号： C07C201/10 ,  C07C205/26

CPC分类号： C07C201/08 ,  C07C201/10 ,  C07C201/16

摘要： 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.