The mass spectra of ten pyrazole compounds have been determined. Fragmentation schemes have been derived by means of the metastable defocusing method. The predominant process is cleavage of the nitrogen‐nitrogen bond resulting in expulsion of HCN. The process second in prominence is the loss of a nitrogen molecule after initial removal of a hydrogen radical or a substituent, giving the species [C 3 H 2 R] + , probably a cyclopropenyl ion. In general, the fragmentation pattern is strongly influenced by the substituent.
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Thuijl et al. (1970) studied this question.
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