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Jouve S.A., EPO - Publication - KB, TaggedPDF v1.27
EP-0062979-A1-19821020
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EP-0062979-A1-19821020
Cis-chrysanthemate esters are isomerized by contact with a Lewis acid, to transform the cis-chrysanthemate ester into trans-chrysanthemate ester through epimerization at C3-position. The starting cis-chrysanthemate ester may be of any optical isomer ratio of (+)-form to (-)-form, including racemic form. The process is particularly suitable for use in the preparation of a (+)-trans-chrysanthemate ester from which (+)-trans-chrysanthemic acid can readily be prepared, the latter being an important acid component of pyrethroidal insecticides.
Cis-chrysanthemate esters are isomerized by contact with a Lewis acid, to transform the cis-chrysanthemate ester into trans-chrysanthemate ester through epimerization at C3-position. The starting cis-chrysanthemate ester may be of any optical isomer ratio of (+)-form to (-)-form, including racemic form. The process is particularly suitable for use in the preparation of a (+)-trans-chrysanthemate ester from which (+)-trans-chrysanthemic acid can readily be prepared, the latter being an important acid component of pyrethroidal insecticides.
en
European Patent Office
EP0062979
EP 0062979
C07C 69/747
C07C 67/333
C07B 20/00
A method of epimerization of alkyl chrysanthemate
A method of epimerization of alkyl chrysanthemate - European Patent Office - EP 0062979 A1
A method of epimerization of alkyl chrysanthemate - European Patent Office - EP 0062979 A1
Adobe PDF Library 8.0
"EP0062979"; "EP 0062979"; "C07C 69/747"; "C07C 67/333"; "C07B 20/00"; "A method of epimerization of alkyl chrysanthemate"
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1982-10-20
82301470
1982-03-22
JP
4781781
1981-03-30
JP
6271481
1981-04-24
C07C 69/747
C07C 67/333
C07B 20/00
SUMITOMO CHEMICAL COMPANY, LIMITED
Suzukamo, Gohfu
Fukao, Masami
DELETED Myerscough, Philip Boyd (GB)R. 102(1)17.01.1996 et al
A method of epimerization of alkyl chrysanthemate
Verfahren zur Epimerisierung von Alkylchrysanthemat
A method of epimerization of alkyl chrysanthemate
Procédé d'épimérisation d'alcoyl chrysanthémate
Cis-chrysanthemate esters are isomerized by contact with a Lewis acid, to transform the cis-chrysanthemate ester into trans-chrysanthemate ester through epimerization at C3-position. The starting cis-chrysanthemate ester may be of any optical isomer ratio of (+)-form to (-)-form, including racemic form. The process is particularly suitable for use in the preparation of a (+)-trans-chrysanthemate ester from which (+)-trans-chrysanthemic acid can readily be prepared, the latter being an important acid component of pyrethroidal insecticides.
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