Process for preparing optical active chrysanthemic acid
Patent Information
- Authority / Receiving Office
- CN Β· China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SUMITOMO CHEM CO LTD
- Publication Date
- 2002-10-09
- Estimated Expiration
- Not applicable Β· inactive patent
Abstract
Description
technical field
[0001] The invention relates to a preparation method of optically active chrysanthemic acid. Background technique
[0002] (+)-2,2-Dimethyl-3-(2-methyl-1-propenyl)cyclopropanecarboxylic acid, known as Chrysanthemum monocarboxylic acid, constitutes the acid component of synthetic pyrethroid insecticides.
[0003] The insecticidal activity of the trans-pyrethroids is generally higher than that of the cis-isomer. In particular, pyrethroids of (+)-trans-chrysanthemum monocarboxylic acid or chrysanthemic acid enriched in (+)-trans-chrysanthemum acid exhibit excellent insecticidal activity. Therefore, there has been a need for an industrially advantageous preparation of (+)-trans-chrysanthemic acid or enriched (+)-trans-chrysanthemic acid.
[0004] As a method for producing an optically active chrysanthemic acid derivative by using a synthetic technique, there is known a method in which (Β±)-trans-chrysanthemum monocarboxylic acid or trans-rich (Β±)-chrysanthmonoca...