摘要:
Halogenation of phenothiazin-5-oxide with benzyltriethylammonium polyhalides (BTEA) under mild conditions afforded chloro-and bromophenothiazines as well as a few unexpected products e.g. 1,3,7,9-tetrachloro-phenothiazin-5-oxide, 7,3'-dibromo-3,10'-diphenothiazinyl tribromide, and 7,3'-dichloro-3,10'-diphenothiazinyl tetrachloroiodate. A new charge-transfer complex of phenothiazine-5-oxide with bromine is reported.