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Carbon–carbon and proton–proton coupling constants in tetramethyl 9aH-quinolizine-1,2,3,4-tetracarboxylate and its alkyl derivatives

✍ Scribed by Krystyna Kamieńska-Trela; Lidia Kania; Elżbieta Bednarek

Publisher: John Wiley and Sons
Year: 1993
Tongue: English
Weight: 395 KB
Volume: 31
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260310311

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✦ Synopsis

Abstract

The ^1^H and ^13^C NMR spectra of the parent tetramethyl 9a__H__‐quinolizine‐1,2,3,4‐tetracarboxylate and 20 of its alkyl‐substituted derivatives were obtained and analysed. The study included measurements of one‐bond carbon–carbon and also proton–proton coupling constants across three, four, five and six bonds. An analysis of the data allowed an estimation of electron distribution and steric requirements in this group of compounds. No correlation was observed between ^1^J(C,C) values and the corresponding bond lengths.

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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

✍ Krystyna Kamieńska-Trela; W. T. Raynes; B. F. Taylor 📂 Article 📅 1987 🏛 John Wiley and Sons 🌐 English ⚖ 517 KB

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 constant