Catalytic dehydrogenation process for the preparation of...

Details Catalytic dehydrogenation process for the preparation of... Catalytic dehydrogenation process for the preparation of...

C - Chemistry, Metallurgy

07

D

260/315.3

C07D 231/12 (2006.01) C07D 231/06 (2006.01)

Patent

CA 1060455

A B S T R A C T A process for the preparation of 3,5-disubsti- tuted pyrazoles useful as herbicides which involves: (a) the reaction of a methyl ketone, such as acetophenone or an appropriate derivative thereof, with an appropriate aldehyde, such as benzaldehyde in the presence of base to form a 1,3-disubstituted .alpha.,.beta.-unsaturated ketone, such as chalcone or a substituted chalcone; (b) the acidification of said .alpha.,.beta.-unsaturated ketone, followed by treatment of the acidified reaction mixture with hydrazine to form a disubstituted pyrazoline; and (c) the catalytic dehydro- genation of said pyrazoline to yield the desired 3,5-di- substituted pyrazole.

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