Kreuzkonjugierte Cyanine und Merocyanine aus Salzen 1-substituierter 2,3-Dimethylchinoxaline. 1. Mitteilung. Über die Isolierung der Farbbasen nach spontaner Umwandlung und nach Oxydation der Reaktanten mit Kupfer(II)acetat oder Silberoxid

✍ Scribed by Dieter Schelz

• Publisher: John Wiley and Sons
• Year: 1981
• Tongue: German
• Weight: 1001 KB
• Volume: 64
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.19810640825

✦ Synopsis

Cross‐conjugated Cyanines and Merocyanines, Obtained from Salts of 1‐Substituted 2,3‐Dimethylquinoxalines. 1. CommunicationVorläufige Mitteilung siehe [1].

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On the Isolation of the Dye Bases Formed upon a Spontaneous Reaction on upon Oxidation of the Reactants with Copper(II) Acetate or Silver Oxide

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 dimethyl‐formamide, 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 ^1^H‐NMR. spectra of the dyes are given. Their structural relationship to Hünig's [2] [8] two‐step‐redox systems is discussed.