US4160779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of methylaminomethylphosphonic acid and its salts
Assignee: Novartis Corp
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Filing: 1978-10-10
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Granted: 1979-07-10
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Expires: 1998-10-10
Abstract
Abstract A process for the production of methylaminomethylphosphonic acid of the formula ##STR1## and salts thereof is given. It consists in reacting bis (chloromethyl)phosphonic acid in aqueous medium with ammonia at elevated temperature under pressure.
Inventors
- 👤 Ludwig Maier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:34
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6581; C07F9/6584; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
A process for the production of methylaminomethylphosphonic acid of the formula ##STR9## and the salts thereof, which comprises reacting bis(chloromethyl) phosphinic acid ##STR10## in water or an aqueous medium, with ammonia at 100°-200° C. and under autogenous pressure, and isolating the methylaminomethylphosphonic acid from the reaction mixture in the form of the free acid or of a salt.
Claim 2
Dependent Claim
58 words
A process for the production of methylaminomethylphosphonic acid of the formula ##STR9## and the salts thereof, which comprises reacting bis(chloromethyl) phosphinic acid ##STR10## in water or an aqueous medium, with ammonia at 100°-200° C. and under autogenous pressure, and isolating the methylaminomethylphosphonic acid from the reaction mixture in the form of the free acid or of a salt.
Claim 3
Dependent Claim
27 words
A process according to claim 1, wherein a mixture of bis(chloromethyl)phosphinic acid and aqueous ammonia is heated in an autoclave for several hours to about 150° C.
Claim 4
Dependent Claim
39 words
A process according to claims 1 or 2, wherein ammonium chloride formed in the reaction mixture is decomposed by addition of sodium hydroxide solution and the sodium salt of methylaminomethylphosphonic acid is isolated by evaporation of the alkaline solution.
References Cited (Backward Citations)
US3160632A
Cited
US3776953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |