Process for isomerizing one of the geometric isomers of an .alph

Details Process for isomerizing one of the geometric isomers of an .alph Process for isomerizing one of the geometric isomers of an .alph

1977-10-18

1979-03-20

Lone, Werren B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603478, 260601H, C07C 4720

Patent

active

041453662

ABSTRACT:
Process for preparing a trans-.alpha.,.beta.-unsaturated aldehyde or a cis-.alpha.,.beta.-unsaturated aldehyde at high conversions and selectivities, which comprises isomerizing a cis-.alpha.,.beta.-unsaturated aldehyde to its corresponding trans-.alpha.,.beta.-unsaturated aldehyde or vice versa by heating the starting aldehyde at a temperature of 30.degree. to 400.degree. C. in the presence of an acid catalyst having a pKa of 1 to 7 in the presence or absence of a solvent. If desired, the resulting isomerization mixture can be separated into the constituent geometric isomers. The isomerization mixture or the separated isomers can be used as pharmaceuticals, their intermediates, or essential ingredients of perfumes and cosmetics.

REFERENCES:
patent: 3210427 (1965-10-01), Redel et al.
Handbook of Physics & Chemistry, 54th edition.
Hubbard "J. Amer. Chem. Society", vol. 78 (1956, pp. 4662-4667.

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