Patent US4229593A successfully refreshed from Google Patents.
US4229593A
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Method to prepare (+)-cis-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid
Assignee: FMC Corp
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Filing: 1979-05-29
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Granted: 1980-10-21
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Expires: 1999-05-29
Abstract
Abstract Process to prepare 3-(2,2-dichloroethenyl)-2,2-di-methylcyclopropanecarboxylic acid enriched with the (+)-cis isomer.
Inventors
- 👤 Kiyoshi Kondo
- 👤 Minoru Suda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:19
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
A method to prepare 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid containing at least 50% (+)-cis isomer which comprises neutralizing racemic cis, trans-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid containing at least 40 percent cis isomers with an alkaloid base selected from 1-ephedrin or quinine in a solvent selected from ethyl acetate or acetonitrile, cooling the resulting solution, isolating the precipitated salt, and hydrolyzing the salt to produce the enriched acid.
Claim 2
Independent Claim
61 words
A method to prepare 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid containing at least 50% (+)-cis isomer which comprises neutralizing racemic cis, trans-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid containing at least 40 percent cis isomers with an alkaloid base selected from 1-ephedrin or quinine in a solvent selected from ethyl acetate or acetonitrile, cooling the resulting solution, isolating the precipitated salt, and hydrolyzing the salt to produce the enriched acid.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein the acid and alkaloid base are employed in approximately equimolar amounts.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein the alkaloid base is quinine and the solvent is ethyl acetate.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein the alkaloid base is 1-ephedrine and the solvent is acetonitrile.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |