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1. 发明授权

US3839325A Synthesis of 4-sulfonamidophenyl hydrazines 失效
标题翻译：合成4-磺基亚氨基乙酰胺
公开(公告)号：US3839325A
公开(公告)日：1974-10-01
申请号：US34434073
申请日：1973-03-23
申请人： GAF CORP
发明人： HOFFSTADT W
IPC分类号： G03C7/384 , C07D87/46
CPC分类号： G03C7/384
摘要： A synthesis is disclosed utilizing p-chlorobenzene-sulfonamide compounds of the following formula:

IN WHICH R and R1 independently represent hydrogen, alkyl, hydroxyalkyl, cycloalkyl, alkaryl, aralkyl or aryl, which may or may not be further substituted, or together with the nitrogen atom form a heterocyclic ring. These compounds are dissolved in dimethyl sulfoxide (DMSO), mixed with aqueous hydrazine hydrate and heated until completely reacted to form 4 - sulfonamidophenyl hydrazines that can be readily separated from the reaction media by precipitation with water. The precipitate can be readily washed and dried to provide a pure, substituted sulfonamido hydrazine. The product is obtained in high yields frequently of about 80 - 90 percent and is sufficiently pure for subsequent use in the preparation of substituted phenyl pyrazolones which in turn are useful as magenta color formers in color photography. For example, p-chloro-benzene-sulfonyl morpholine is dissolved in DMSO and reacted under reflux conditions with aqueous hydrazine hydrate to form 4 - morpholino - sulfonamido-phenyl hydrazine having a melting point of 162*- 164*C after purification.
摘要翻译：公开了使用下式的对氯苯磺酰胺化合物的合成：

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