JOURNAL OF THE COLLEGE OF SOIENOE, IMPERIAL ÜNIVERSlir, 

 TOKYO, JAPAN. 



VOL. XXV., ARTICLE 13. 



A Simple Method of Preparing the Imides 

 of the Aromatic Sulphonic Acids. 



By 

 Tamemasa Haga, Rigakuhakmhi. 



While aromatic sulpliamides are quite well known substances, 

 we have only a very scanty knowledge of the corresponding 

 sulphimides. No mention is made of them even in Beilstein'ö 

 Handbuch. The only work that notices them is the second 

 supplement to Richter's Lexikon, which refers to the Chemisches 

 Central-Blatt, 1901, II, 1185, in which an abstract is given of a 

 patent by the Farbwerke vorm. Meister, Lucius, und Brüning, 

 Höchst am Main. According to it, these imides are prepared by 

 heating alkali derivatives of aromatic sulpliamides with aromatic 

 sulphochlorides at high temperatures, and this is the only method 

 hitherto known of preparing them. The accounts given of these 

 compounds are, moreover, very incomplete, not even their melting 

 points being given, and some of them had, apparently, been 

 obtained only in an impure state. 



The author finds that these sulphimides can be easily 

 prepared by reducing aromatic sulphohydroxylamines, sulphur 

 dioxide being the most suitable reducing agent for the purpose. 

 The aromatic sulphohydroxylamines are readily obtainable 

 by treating aromatic sulphinic acids with nitrous acid (AV. 



