Studies on Indigoid Dyes. Part XI. 2-(4/6-Iodo)-thionaphthene-9'-Phenanthrene Indigos

Chemical Laboratory, Bihar National College, Patna-4 Manuscript received 18 April 1973; revised 25 August 1973; accepted 20 September 1973 Several dyes have been prepared by the condensation of 4-iodo and 6-iodothioindoxyl with phenaothraqainone and substituted phenanthraquinones. Their dyeing and other. properties have been studied and compared with those of the isomeric 5-iodo and 7-iodo substituted dyes