Ringschlüsse an Chinonylmethanfarbstoffen und analogen Merocyaninen. 6. Mitteilung. Über die Reaktivität des Cyclohexylrestes in 2-Chlor-3-[(1-cyclohexyl-6-fluor-3-methyl-1H-chinoxalin-2-yliden)methyl]-1,4-naphthochinon
✍ Scribed by Dieter Schelz; Niklaus Rotzler
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- German
- Weight
- 267 KB
- Volume
- 65
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Ring Closure in Quinonylmethane Dyes On the Reactivity of the Cyciohexyl Moiety in 2‐Chloro‐3‐[(1‐cyclohexyl‐6‐fluoro‐3‐methyl‐1__H__‐quinoxalin‐2‐ylidene)niethyl]‐1,4‐naphthoquinonc
The reactive title compound (1a, X = F, R^1^ = C^6^H^11^, R^2^=Cl) was obtained from the reaction of 1‐cyclohexyl‐6‐fluoro‐2,3‐dimethylquinoxalinium perchlorate with 2,3‐dichloro‐1,4‐naphthoquinone. Upon treatment with pyridine and acetic acid in acetone and separation of the desired naphthophenazinone 2a, an unexpected azepinoquinoxaline 4a was isolated. The structure of 4a was determined by its mass and 360‐MHz‐^1^H‐NMR. spectra in connection with decoupling experiments.