Treatment of beta-diketones and the corresponding beta-enaminoketones,
having modified carane (2-ethyl-6,6-dimethylbicyclo[3.1.0]hexane) and
p-menthane (3-ethyl-1-isopropylcyclopentane) skeletons, with aryl-and
alkylhydrazines results in regioselective formation of N-substituted
pyrazoles or stable pyrazolinols depending on the nature of the substi
tuent at the hydrazine nitrogen. (C) 1997 Elsevier Science Ltd.