Method for preparing 1,2-naphthaqinone-2-diazo-4-sulfonic acid chloride

Application Number: 00108630
Application Date: 2000.04.14
Publication Number: 1273968
Publication Date: 2000.11.22
Priority Information: 1999/4/15 JP 107843/1999
International: C07C303/08;C07C309/88
Applicant(s) Name: Toyo Snythesis Industries Co., Ltd.
Inventor(s) Name: Iida Hirotada;Tobishimia Naritada;Sato Naoki
Patent Agency Code: 11038
Patent Agent: du jingyang
Abstract An effective method for producing 1,2-naphthoquinone-2-diazide-4-sulfonyl chloride at high yield, wherein formation of impurities is prevented. The method includes the following steps: 1,2-naphthoquinone-2-diazide is reacted with chlorosulfuric acid, to thereby produce a mixture of a sulfonated compound and a chlorosulfonated compound of the diazide; and to the mixture, at least one substance selected from among thionyl chloride and phosphorus pentachloride is added for further reaction, to thereby obtain 1,2-naphthoquinone-2-diazide-4-sulfonyl chloride.