The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 20, 1979
Filed:
Oct. 18, 1977
Yataro Ichikawa, Iwakuni, JP;
Teizo Yamaji, Yamaguchi, JP;
Teijin Limited, Osaka, JP;
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.