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. https://doi.org/10.1155/1997/124259
Azapentalenes. XLIV. 1H and 13C-NMR study of mesoionic pyrazolo[1,2-a]pyrazoles
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.
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