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Reaction of π-Deficient Aromatic Heterocycles with Ammonium Polyhalides. Part 3. Halogenation of Phenothiazin-5-oxide with Benzyltriethylammonium Polyhalides.-The title reaction affords chloroand bromophenothiazines (III) and ( V) as well as a few unexpected products such as compounds (II), (IV), and (VI). A new charge-transfer complex of phenothiazine-5-oxide with bromine (VII) is reported. -(CUSTELCEANU, R.; VLASSA, M.; SILBERG, I. A.; Monatsh. Chem. 128 (1997) 8-9, 919-925; Dep. Org. Chem., Fac. Chem. Chem. Eng., Babes-Bolyai Univ., RO-3400 Cluj-Napoca, Rom.; EN)

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The reactions of phenothiazine with benzyltriethylammonium polyhalides under mild, nontoxic conditions yield halogenophenothiazines and, for the first time to our knowledge, charge-transfer complexes with mixed halogenes of the type phenothiazine Cl x I y .