Reaction of 1H-1-oxo-2,4,6,8-tetrakis(tert-butyl) phenoxazine with certain group II?IV metals

It has already been shown that 2-amino-4,6-di(tert-butyl)phenol reacts with 3,5-di(tert-butyl)-o-benzoquinone to form 1H-1-oxo-2,4,6,8-tetrakis(tert-butyl)phenoxazine (I), which is readily reduced by alkali metals to the corresponding semiquinone anion-radical (II), and further to the diamagnetic di...

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Veröffentlicht in:Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States) Div. Chem. Sci. (Engl. Transl.); (United States), 1987-01, Vol.36 (1), p.60-64
Hauptverfasser: Karsanov, I. V., Ivakhnenko, E. P., Khandkarova, V. S., Rubezhov, A. Z., Okhlobystin, O. Yu, Minkin, V. I., Prokof'ev, A. I., Kabachnik, M. I.
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Sprache:eng
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Zusammenfassung:It has already been shown that 2-amino-4,6-di(tert-butyl)phenol reacts with 3,5-di(tert-butyl)-o-benzoquinone to form 1H-1-oxo-2,4,6,8-tetrakis(tert-butyl)phenoxazine (I), which is readily reduced by alkali metals to the corresponding semiquinone anion-radical (II), and further to the diamagnetic dianion (IIA). They made use of this ability of (I) to undergo reduction to prepare anion-radical salts with different group II-IV metals in the form of their amalgams. In the EPR spectrum of the anion-radical complex (III) formed in the reduction of (I) by a thallium amalgam, the HFI constants of the unpaired electron with magnetic nuclei of the organic ligand are close to those of the K-salt (II), and a substantial HFI is observed with the /sup 203,205/Tl nuclei. This unequivocally proves that the complex has a semiquinone structure, since an HFI on the /sup 203,205/Tl nuclei of such an order of magnitude is characteristic of o-benzoquinone salts with a thallium cation.
ISSN:0568-5230
1573-9171
DOI:10.1007/BF00953846