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■ Solid State Behaviour of "Dynamic Compounds": A ¹³C CP/MAS NMR Spectroscopy Study

Robert Faure, Emile-Jean Vincent, André Rousseau, and José Elguero

*Instituto de Química Médica, C. S. I. C., Calle Juan de Cierva, 3, 28006 Madrid, Spain

Abstract

The ¹³C CP/MAS NMR spectra of 2-methylimidazole, antipyrine, 1-phenyl-3-hydroxy-5-methylpyrazole, 1-p-bromophenyl-3-methyl-pyrazolin-5-one, tetrazolo[5,1-b]benzothiazole,and 9-acetylcarbazole have been recorded and the signals assigned. Problems such as annular prototropic tautomerism, functional tautomerism, azido/tetrazole isomerism, and rotational isomerism have been studied and, in most cases, solved.