Helvetica Chimica Acta p. 2665 - 2680 (1981)
Update date:2022-08-30
Topics:
Schelz, Dieter
Quaternary salts of 2,3-dimethylquinoxalines 1-in some cases in the presence of the methylidene bases 2-yield, on dissolving in dimethyl sulfoxide or dimethylformamide, the dye bases 3 in a spontaneous reaction.Higher yields of 3 are obtained by oxidation of 1, 2 or 1/2 with copper(II) acetate or silver oxide.VIS. and 1H-NMR. spectra of the dyes are given.Their structural relationship to Huenig's two-step-redox systems is discussed.
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