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US4486358A
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Process for producing N-phosphonomethylglycine
Assignee: Novartis Corp
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Filing: 1982-11-19
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Granted: 1984-12-04
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Expires: 2002-11-19
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 01:09
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808; C07F9/3813
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
59 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, said sulfur dioxide and glyoxal being simultaneously introduced into a suspension of said aminomethanephosphonic acid in water, and isolating the resulting product.
Claim 2
Dependent Claim
59 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, said sulfur dioxide and glyoxal being simultaneously introduced into a suspension of said aminomethanephosphonic acid in water, and isolating the resulting product.
Claim 3
Dependent Claim
19 words
A process according to claim 1, wherein the suspension of aminomethanephosphonic acid is preheated to 30° to 90° C.
Claim 4
Dependent Claim
19 words
A process according to claim 2, wherein the suspension of aminomethanephosphonic acid is preheated to 35° to 75° C.
Claim 5
Dependent Claim
22 words
A process according to claim 1, wherein the amount of sulfur dioxide employed is less than 2 mole per mole of glyoxal.
Claim 6
Dependent Claim
22 words
A process according to claim 4, wherein the amount of sulfur dioxide employed is 0.3 to 1.5 mole per mole of glyoxal.
Claim 7
Dependent Claim
17 words
A process according to claim 1, wherein the reaction mixture is heated to 60° to 120° C.
Claim 8
Dependent Claim
47 words
A process according to claim 1, wherein sulfur dioxide and glyoxal are added simultaneously to a suspension of aminomethanephosphonic acid at 30° to 90° C., the formed solution is heated to 85° to 105° C. for 20 to 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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |