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US 5,532,421 AGranted
Method for the isomerization of cis-alkenyl compounds
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsTakanobu Terauchi, Toyohisa Sakurada, Takehiko Fukumoto, Hiroshi Suzuki
Life of this patent
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Abstract
An object of the present invention is to provide a method for the preparation of geometrical isomers which are important as constituents of synthetic pheromones, synthetic perfumes, terpenes and the like (i.e., a method for the isomerization of cis-alkenyl compounds to their trans-isomers). In this method, the above-described object is accomplished by reacting a cis-alkenyl compound in the presence of nitric acid used as the sole catalyst.
Claims5
A method for the isomerization of a cis-alkenyl compound to their trans-isomers which comprises:
- a) reacting, under isomerization conditions the cis-alkenyl compound selected from the group consisting of alkenes, alkenols, alkenyl halides, alkenoic acids and alkenyl esters in the presence of a catalyst consisting essentially of nitric acid- has been inserted;
- and b) recovering the trans-isomer compound.
Dependencies are inferred from the claim text.