Substitution Derivatives of Diphenylene Sulphide etc. 1435 309. Xubstitution Derivatives of Diphenylene Sdphide and Diphenylenesulphone. By N. M. CULLINANE C. G. DAVIES,and G. I. DAVIES. DIPHENYLENE sulphide was prepared (1)from 2-nitrodiphenyl sulphide by the usual reduc- tion and diazotisation process ; (2)by th