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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
Author(s) -
Schelz Dieter
Publication year - 1981
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19810640825
Subject(s) - chemistry , polymer chemistry , redox , copper , medicinal chemistry , conjugated system , yield (engineering) , cyanine , inorganic chemistry , organic chemistry , materials science , physics , quantum mechanics , metallurgy , fluorescence , polymer
Cross‐conjugated Cyanines and Merocyanines, Obtained from Salts of 1‐Substituted 2,3‐Dimethylquinoxalines. 1. Communication Vorläufige Mitteilung siehe [1]. . 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.