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Carbon-13 chemical shifts and carbon-proton coupling constants in 4H- and 9aH-quinolizine esters and some of their methyl derivatives

✍ Scribed by Krystyna Kamieńska-Trela; W. T. Raynes; B. F. Taylor

Publisher: John Wiley and Sons
Year: 1987
Tongue: English
Weight: 517 KB
Volume: 25
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260250503

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✦ Synopsis

The protop coupled and decoupled 13C NMR spectra of 4H-quinoliziue 1,2,3,44etracarboxylate and its less stable tautomer 9aH-quinolizine 1,2,3,4-tetracarboxylate have been investigated. All 13C resonances Pave been assigned, and a number of the one-, two-and three-bond carbon-proton coupling constants obtained for these compounds and some oi their methyl derivatives. The principal conclusion from the data is that the nitrogen atom is positively charged as a result of extensive conjugation.

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