Although quite a few papers have been devoted to the13C NMR study of pyrazoles, there is one problem that has not yet been satisfactorily solved, namely the assignment of the2JCH and3JCH coupling constants. In general, the3C chemical shifts and1JCH coupling constants can be easily attributed, but the assigment of the long-range2JCH and3JCH coupling constants is not straight forward. In N- substituted pyrazoles, where annular tautomerism is prevented, each carbon atom can have two long-range coupling constants with the ring protons.