Journal of Spectroscopy

Journal of Spectroscopy / 1997 / Article

Open Access

Volume 13 |Article ID 124259 |

Rosa María Claramunt, Sviatoslav Trofimenko, Isabel Rozas, José Elguero, "Azapentalenes. XLIV. 1H and 13C-NMR study of mesoionic pyrazolo[1,2-a]pyrazoles", Journal of Spectroscopy, vol. 13, Article ID 124259, 11 pages, 1997.

Azapentalenes. XLIV. 1H and 13C-NMR study of mesoionic pyrazolo[1,2-a]pyrazoles

Received03 Jan 1996
Revised12 Mar 1996


The 1H and 13C chemical shifts as well as the 1H–1H and 1H–13C coupling constants of sixteen pyrazolo[1,2-a]pyrazole derivatives have been measured. The most relevant features are discussed using resonance forms and simple additive models. AM1 semi-empirical calculations have been carried out to provide a rationale for the NMR results.

Copyright © 1997 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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