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US4369142A
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Process for producing N-phosphonomethylglycine
Assignee: Novartis Corp
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Filing: 1981-12-03
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Granted: 1983-01-18
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Expires: 2001-12-03
Abstract
Abstract The novel process for producing N-phosphonomethylglycine comprises reacting aminomethanephosphonic acid with glyoxal, in an aqueous medium, in the presence of sulfur dioxide. The active substance obtained is a herbicide having a very wide spectrum of activity.
Inventors
- 👤 Hans Moser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:57
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3813
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
42 words
A process for producing N-phosphonomethylglycine of the formula I ##STR3## by reacting aminomethanephosphonic acid of the formula II ##STR4## in an aqueous medium, with glyoxal of the formula III OHC--CHO (III) in the presence of sulfur dioxide, and isolating the resulting product.
Claim 2
Dependent Claim
42 words
A process for producing N-phosphonomethylglycine of the formula I ##STR3## by reacting aminomethanephosphonic acid of the formula II ##STR4## in an aqueous medium, with glyoxal of the formula III OHC--CHO (III) in the presence of sulfur dioxide, and isolating the resulting product.
Claim 3
Dependent Claim
22 words
A process according to claim 1, wherein the sulfur dioxide is introduced into a suspension of aminomethanephosphonic acid and glyoxal in water.
Claim 4
Dependent Claim
25 words
A process according to either of claims 1 or 2, wherein the minimum amount of sulfur dioxide is such that a clear solution is formed.
Claim 5
Dependent Claim
15 words
A process according to claim 3, wherein the reaction mixture is saturated with sulfur dioxide.
Claim 6
Dependent Claim
15 words
A process according to claim 1, wherein the reaction mixture is heated to 60°-120° C.
Claim 7
Dependent Claim
20 words
A process according to claim 5, wherein the temperature is between 85° C. and boiling temperature of the reaction mixture.
Claim 8
Dependent Claim
17 words
A process according to claim 1, wherein an aqueous solution of monomeric or polymeric glyoxal is used.
Claim 9
Dependent Claim
14 words
A process according to claim 5, wherein the solution is heated for 5-120 minutes.
Claim 10
Dependent Claim
16 words
A process according to claim 1, wherein the sulfur dioxide is used in the bound form.
Claim 11
Dependent Claim
40 words
A process according to claim 9, wherein the sulfur dioxide is used in the form of hydrogen sulfite of sodium, potassium or calcium, or, together with glyoxal, in the form of its bis hydrogen sulfite with sodium, potassium or calcium.
Claim 12
Dependent Claim
42 words
A process according to claim 1, wherein a suspension of aminomethanephosphonic acid and glyoxal in water is saturated at 5°-20° C. with sulfur dioxide, the formed solution is heated at 85°-105° C. for 20-40 minutes, and the product is isolated by crystallisation.
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) | 1986-01-17 | 1986-07-19 | 1987-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-17 | 1990-07-19 | 1991-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-17 | 1994-07-19 | 1995-01-18 | $7700.00 | Window Closed / Lapsed |