Catalytic dehydrogenation process for the preparation of 3,5-dis

Details Catalytic dehydrogenation process for the preparation of 3,5-dis Catalytic dehydrogenation process for the preparation of 3,5-dis

1975-02-12

1976-04-20

Moyer, Donald B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260310D, 260311, C07D 4902, C07D 5700, C07D 9900

Patent

active

039520102

ABSTRACT:
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 .alpha.,.beta.-unsaturated ketone, followed 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.

REFERENCES:
Chemical Abstracts, Vol. 52: 11013f (1958).
Chemical Abstracts, Vol. 79: 136707z (1973).

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