[N 1-nicotinoyl and isonicotinoylpyrazoles]

Synthesis of twelve N 1-nicotinoyl and isonicotinoylpyrazoles by reaction of 4,5-tetra-, penta-, hexamethylenepyrazoles, dihydronaphtopyrazole, bornylenepyrazole and cineolylenepyrazole with nicotinoyl and isonicotinoylchloride, is described. The structure of N 1-derivatives of these compounds was ascertained by comparison of N.M.R. spectra with those of 1-nicotinoyl and 1-isonicotinoyl-4,5-pentamethylene-5-hydroxy-2-pyrazoline, obtained by reaction of 2-hydroxymethylenecycloheptanone with nicotinoyl and isonicotinoylhydrazide, respectively. N 1-isonicotinoylbornylenepyrazole shows weak C.N.S. depression, muscle relaxation and anticonvulsant activity.