US4028403A
Expired / Lapsed
US
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Process for preparing m-aminobenzenephosphonic acid
Assignee: Burlington Industries Inc
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Filing: 1976-06-07
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Granted: 1977-06-07
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Expires: 1996-06-07
Abstract
Abstract M-Aminobenzenephosphonic acid is prepared from the relatively inexpensive starting material benzenephosphonous acid by nitrating the acid starting material under controlled conditions followed by oxidation and reduction procedures to produce the desired product in high yields.
Inventors
- 👤 William A. Sanderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:49
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3834
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A process for preparing m-aminobenzenephosphonic acid comprising the steps of: a. reacting benzenephosphonous acid in a sulfuric acid medium under nitrating conditions by the dropwise addition of nitric acid at a temperature of about 0° C. to about 5° C. to form m-nitrobenzenephosphonous acid in a reaction mixture; b. warming the reaction mixture to about 20°-25° C. or a higher temperature sufficient to initiate oxidation of the m-nitrobenzenephosphonous acid, and thereafter continuing the oxidation reaction until m- nitrobenzenephosphonic acid is formed; c. reducing the m-nitrobenzenephosphonic acid with hydrogen to form m-aminobenzenephosphonic acid; and d. recovering the m-aminobenzenephosphonic acid from the reaction mixture.
Claim 2
Dependent Claim
102 words
A process for preparing m-aminobenzenephosphonic acid comprising the steps of: a. reacting benzenephosphonous acid in a sulfuric acid medium under nitrating conditions by the dropwise addition of nitric acid at a temperature of about 0° C. to about 5° C. to form m-nitrobenzenephosphonous acid in a reaction mixture; b. warming the reaction mixture to about 20°-25° C. or a higher temperature sufficient to initiate oxidation of the m-nitrobenzenephosphonous acid, and thereafter continuing the oxidation reaction until m- nitrobenzenephosphonic acid is formed; c. reducing the m-nitrobenzenephosphonic acid with hydrogen to form m-aminobenzenephosphonic acid; and d. recovering the m-aminobenzenephosphonic acid from the reaction mixture.
References Cited (Backward Citations)
SU249381A1
Cited
US2799701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |