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Digitale Medien

Multinuclear magnetic resonance study of some mesoionic oxatriazoles containing nitrogenous exocyclic groups (1995)

Bocian, Wojciech ; Jaźwínski, Jarosław ; Stefaniak, Lech ; [weitere]

Springer

Chemistry of heterocyclic compounds 31 (1995), S. 1103-1107

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ISSN: 1573-8353

Schlagwort(e): 1H,13C,14N, and15N NMR ; chemical shifts ; line widths ; mesoionic oxatriazoles ; charge localization ; valence tautomerism

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract 1H,13C,14N and15N NMR measurements are reported for four mesoionic 1-oxa-2, 3, 4-triazoles containing exocyclic nitrogenous groups. The NMR signal assignments are discussed and compared with those previously published for some corresponding oxatriazoles. The results obtained support the proposed cyclic mesoionic structures for the compounds studied. The questions of possible charge delocalization and valence tautomerism are addressed. Compound with N− H as a exocyclic group (Fig. 1) is found to be relatively unstable, this is attributed to proton migration in the corresponding non-cyclic form of this molecule.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01165057

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