HUT45476A - Process for producing optical isomers of transchrysantemic acid - Google Patents
Process for producing optical isomers of transchrysantemic acidInfo
- Publication number
- HUT45476A HUT45476A HU330286A HU330286A HUT45476A HU T45476 A HUT45476 A HU T45476A HU 330286 A HU330286 A HU 330286A HU 330286 A HU330286 A HU 330286A HU T45476 A HUT45476 A HU T45476A
- Authority
- HU
- Hungary
- Prior art keywords
- acid
- optical purity
- fraction
- optical isomers
- transchrysantemic
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
HUT045476 In order to obtain optical isomers of trans-chrysanthemumic-acid, an enantiomer of 3-40% optical purity is agitated in an organic solvent at a temp. between -10 and +30 deg.C. The resulting crystalline trans-chrysanthemumic acid is removed and the optically active fraction is extracted from the liq. phase. If needed, the process is repeated once or a number of times. Conversely, an enantiomer mixt. of at least 40% optical purity is allowed to stand between -15 deg.C and 35 deg.C and the fluid fraction of greater optical purity is sepd. from the solid crystalline fraction of lower optical purity. This process can be repeated one or more times, using the melt as the starting point. The solid crystalline fraction is reagitated with the aid of an organic solvent in order to separate the racemic and optically pure parts.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
HU330286A HU203715B (en) | 1986-07-31 | 1986-07-31 | Process for separating optically active isomeres of cys-free trans chrisanthemic acid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
HU330286A HU203715B (en) | 1986-07-31 | 1986-07-31 | Process for separating optically active isomeres of cys-free trans chrisanthemic acid |
Publications (2)
Publication Number | Publication Date |
---|---|
HUT45476A true HUT45476A (en) | 1988-07-28 |
HU203715B HU203715B (en) | 1991-09-30 |
Family
ID=10963487
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
HU330286A HU203715B (en) | 1986-07-31 | 1986-07-31 | Process for separating optically active isomeres of cys-free trans chrisanthemic acid |
Country Status (1)
Country | Link |
---|---|
HU (1) | HU203715B (en) |
-
1986
- 1986-07-31 HU HU330286A patent/HU203715B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
HU203715B (en) | 1991-09-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
ES8402260A1 (en) | Process for the continuous thermal decomposition of carbamic-acid esters. | |
DE69330963D1 (en) | PRODUCTION OF ALUMINOSILICATE ZOLITHES | |
ES2097415T3 (en) | PROCEDURE FOR THE EXTRACTION OF FATS AND OILS. | |
DK0610506T3 (en) | Process for preparing the right eicosapentaenoic acid or ester thereof | |
HK1026223A1 (en) | Purifying polyunsaturated fatty acid glycerides | |
ATE128006T1 (en) | METHOD FOR PRODUCING CHOCOLATE. | |
DE69929998D1 (en) | METHOD FOR THE PRODUCTION OF ESTERS | |
HUT45476A (en) | Process for producing optical isomers of transchrysantemic acid | |
ES8705835A1 (en) | A process for the resolution of a racemate. | |
EP0937702A4 (en) | Method of refining benzoic acid | |
Nohira et al. | Optical resolution of. ALPHA.-methylbenzylamine and 1-phenyl-2-(p-tolyl) ethylamine by preferential crystallization. | |
FI93833C (en) | Process for the preparation of propionic acid derivatives | |
KR890700559A (en) | Process for the preparation of para-xylol having a purity of at least 99.5% | |
JPS5534115A (en) | Crystallization method | |
KR910014340A (en) | Method for preparing 4, 4'-diisocyanato dicyclohexylmethane having high trans and trans-isomer content | |
DE69315720D1 (en) | Process for the separation of 1,2-isopropylidene glycerol benzoyl ester enantiomers | |
KR920000694A (en) | Method for racemic separation of 2,2-dimethylcyclopropanecarboxylic acid | |
JPS55115846A (en) | Optical resolution of dl-mandelic acid | |
DE59309480D1 (en) | METHOD FOR PRODUCING A PHYSICALLY STABLE, CRYSTALLINE GAMMA MODIFICATION OF PARA-AMINOBENZOLSULFONAMIDE | |
KR900004266A (en) | Method of making nedicinal mel | |
JPS5559143A (en) | Purification of diethylene glycol bis(allyl carbonate) | |
JPS5462977A (en) | High pressure separating method for eutectic mixture | |
NO891069D0 (en) | PROCEDURE FOR PURIFICATION OF PURE ALFA-L-ASPARTYL-L-PHENYLALANINE METHYL ESTER (ALFA-APM). | |
ES2020789A6 (en) | Process for the resolution of intermediates useful in the preparation of dilthiazem | |
BR8801711A (en) | PROCESS OF PREPARATION OF OPTICALLY PURE ALKYLA LACTATES |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
HMM4 | Cancellation of final prot. due to non-payment of fee |