Catalytic dehydrogenation process for the preparation of 3,4,5-t

Details Catalytic dehydrogenation process for the preparation of 3,4,5-t Catalytic dehydrogenation process for the preparation of 3,4,5-t

1976-01-08

1977-03-29

Moyer, Donald B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260310D, C07D23112, C07D23118

Patent

active

040148963

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:
patent: 3952010 (1976-04-01), Garber et al.

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