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 231/02 (2006.01) C07D 231/12 (2006.01)

Patent

CA 1037048

ABSTRACT OF THE DISCLOSURE There is provided a process for the preparation of 3,5-disubstituted pyrazoles 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 a,.beta.-unsaturated ketone, follow- ed by treatment of the acidified reaction mixture with hydrazine to form a disubstituted pyrazoline, and (c) the catalytic dehydrogenation of said pyrazoline to yield the desired 3,5-disubstituted pyrazole.

207577

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