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Ringschlüsse an Chinonylmethanfarbstoffen und analogen Merocyaninen. 3. Mitteilung. Chinoide Derivate des anellierten Tetrahydro‐isochinolino‐chinoxalins. Ringschluss nach 1,7‐Verschiebung von Wasserstoff?
Author(s) -
Schelz Dieter,
Priester Martin
Publication year - 1975
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.19750580837
Subject(s) - chemistry , anthraquinones , quinoxaline , mass spectrum , stereochemistry , medicinal chemistry , alkyl , organic chemistry , ion , botany , biology
Cyclization Reactions of Quinonylmethane Dyes and Analogous Merocyanines. 3. Communication. Quinoid Derivatives of the Anellated Tetrahydro‐quinoxalino‐quinoxaline. Cyclization Following 1,7‐Hydrogene‐Shift? The title compounds were obtained by proton catalyzed cyclization of the corresponding 2‐(1‐alkyl‐3‐methyl‐1,2‐dihydroquinoxalin‐2‐ylidenmethyl)‐1,4‐naphtho‐ and 1,4‐anthraquinones. The visible and 1 H‐NMR.‐ and some mass spectra of the dyes are given. Mechanistic aspects of the new‐type cyclization reaction are discussed.