Reaction of π-Deficient Aromatic Heterocycles with Ammonium Polyhalides III [1]. Halogenation of Phenothiazin-5-oxide with Benzyltriethylammonium Polyhalides

Article abstract of DOI:10.1007/BF00807101

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.