The synthesis under MW irradiation without solvent of 19 pyrazoles, of which only 8 were known, is described.
They bear C-methyl groups and trityl, diphenylmethyl and benzyl groups at positions 1 and 4 of the pyrazole ring. In the
reaction between pyrazole and trityl bromide an unexpected reaction occurred and 4-(9-phenyl-9H-fluoren-9-yl)-1Hpyrazole
(7) was isolated.