Summary
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.
Zusammenfassung
Halogenierung von Phenothiazin-5-oxid mit Benzyltriethylammoniumhalogeniden (BTEA) unter milden Bedingungen ergab neben Chlor- und Bromphenothiazinen einige unerwartete Reaktionsprodukte wir z.B. 1,3,7,9-Tetrachlorphenothiazin-5-oxid, 7,3′-Dibrom-3,10′-diphenothiazinylbromid und 7,3′-Dichlor-3,10′-diphenothiazinyltetrachloriodat. Außerdem wird über einencharge-transfer-Komplex von Phenothiazin-5-oxid mit Brom berichtet.
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Custelceanu, R., Vlassa, M. & Silberg, I.A. Reaction of π-deficient aromatic heterocycles with ammonium polyhalides III. Halogenation of phenothiazin-5-oxide with benzyltriethylammonium polyhalides. Monatsh Chem 128, 919–925 (1997). https://doi.org/10.1007/BF00807101
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DOI: https://doi.org/10.1007/BF00807101