US3923877A
Expired / Lapsed
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Preparation of N-phosphonomethyl glycine
Assignee: Imperial Chemical Industries Ltd
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Filing: 1973-10-11
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Granted: 1975-12-02
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Expires: 1993-10-11
Abstract
Abstract A herbicidal compound, N-phosphonomethyl glycine is prepared by reacting 1,3,5-tricyanomethyl-hexahydro-1,3,5,-triazine with a dihydrocarbyl hydrogen phosphite in the presence of a catalyst such as a Lewis acid to form an ester of N-phosphonomethylglyconitrile which ester is thereafter hydrolyzed and the desired N-phosphonomethyl glycine is recovered.
Inventors
- 👤 John Edward Duncan Barton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:57
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3813
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
A PROCESS OF PROCESS OF PREPARING THE COMPOUND N-PHOSPHONOMETHYL GLYCINE, HAVING THE FORMULA:
Claim 2
Dependent Claim
13 words
A PROCESS OF PROCESS OF PREPARING THE COMPOUND N-PHOSPHONOMETHYL GLYCINE, HAVING THE FORMULA:
Claim 3
Dependent Claim
24 words
A process according to claim 1 wherein the groups R1 and R2 each represent an alkyl radical of from 1 to 6 carbon atoms.
Claim 4
Dependent Claim
15 words
A process according to claim 1 wherein the catalyst comprises hydrogen chloride or hydrogen bromide.
Claim 5
Dependent Claim
30 words
A process according to claim 1 wherein the reaction of the 1, 3,5-tricyanomethylhexahydro-1,3,5-triazine with the phosphorous ester is carried out in a diluent comprising an excess of the phosphorous ester.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |