13 C N.m.r. spectra of solid samples of pyrazole and imidazole were obtained using the ‘magic angle’ spinning technique; both compounds show three separate signals corresponding to Cs structures (no proton exchange).
J. Elguero, A. Fruchier and V. Pellegrin, J. Chem. Soc., Chem. Commun., 1981, 1207 DOI: 10.1039/C39810001207
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