Donald R Fields

US Patent:

49527231, Aug 28, 1990

Filed:

Jul 31, 1989

Appl. No.:

7/386738

Inventors:

Donald L. Fields - Manchester MO
Raymond C. Grabiak - Maryland Heights MO
Dennis P. Riley - Ballwin MO

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C07F 938

US Classification:

562 17

Abstract:

A process for the production of N-phosphonomethylglycine comprising contacting N-phosphonomethyliminodiacetic acid with a molecular oxygen-containing gas in the presence of a catalyst selected from the group consisting of the salts and salt complexes of manganese, cobalt, iron, nickel, chromium, ruthenium, aluminum, moleybdenum, vanadium and cerium, and an effective amount of a dipyridyl compound.

US Patent:

49373765, Jun 26, 1990

Filed:

May 25, 1989

Appl. No.:

7/356484

Inventors:

Donald L. Fields - Manchester MO
Raymond C. Grabiak - Maryland Heights MO
Dennis P. Riley - Ballwin MO

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C07F 938

US Classification:

562 16

Abstract:

A process for the production of N-phosphonomethylglycine comprising contacting N-phosphonomethyliminoacetic acid with a molecular oxygen-containing gas in the presence of a catalyst selected from the group consisting of the salts and salt complexes of manganese, cobalt, iron, nickel, chromium, ruthenium, aluminum, molybdenum, vanadium and cerium, and an effective amount of a quinone or hydroquinone.

US Patent:

50618202, Oct 29, 1991

Filed:

Oct 22, 1990

Appl. No.:

7/600954

Inventors:

Donald L. Fields - Manchester MO
Raymond C. Grabiak - Maryland Heights MO
Karl E. Koenig - Ballwin MO
Dennis P. Riley - Ballwin MO

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C07F 938

US Classification:

560 17

Abstract:

A process for the production of N-phosphonomethylglycine comprising contacting N-phosphonomethyliminodiacetic acid with a peroxide in the presence of a catalyst selected from the group consisting of the salts and salt complexes of cobalt and vancadium, and an effective amount of dipyridyl compound.

US Patent:

50951408, Mar 10, 1992

Filed:

Apr 15, 1991

Appl. No.:

7/684745

Inventors:

Donald L. Fields - Manchester MO

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C07F 938

US Classification:

562 17

Abstract:

A process is provided for producing N-phosphonomethylglycine by the oxidation of N-phosphonomethyliminodiacetic acid with a peroxide to form an intermediate N-phosphonomethyliminodiacetic acid-N-oxide. Thereafter, the N-phosphonomethyliminodiacetic acid-N-oxide is converted to N-phosphonomethylglycine by adding a catalytic amount of a metal selected from the group consisting of iron, zinc, aluminum, vanadium and copper, or a compound selected from the group consisting of water-soluble vanadium compounds, ferrous salts and cuprous salts.

US Patent:

50416278, Aug 20, 1991

Filed:

Jan 19, 1990

Appl. No.:

7/465626

Inventors:

Sherrol L. Baysdon - Chesterfield MO
Donald L. Fields - Manchester MO

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C07F 938

US Classification:

562 16

Abstract:

N-Acyl-aminomethylphosphonic acids represented by the formula ##STR1## wherein R is selected from the group consisting of methyl and aryl are prepared by: (a) bringing together under substantially anhydrous reaction conditions an amide represented by the formula ##STR2## wherein R is as defined above and paraformaldehyde; and thereafter, (b) adding phosphorous trihalide to the reaction mixture.

US Patent:

50475797, Sep 10, 1991

Filed:

Jun 25, 1990

Appl. No.:

7/543002

Inventors:

Jozef G. Glowka - New South Wales, AU
Kai K. Lau - New South Wales, AU
Henryk Krawczyk - Orzeszkowej, PL
Donald L. Fields - Manchester MO

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C07F 938

US Classification:

562 17

Abstract:

An improved process is disclosed for the preparation of N-phosphonomethylglycine by the oxidation of N-phosphonomethyliminodiacetic acid. In the process N-phosphonomethyliminodiacetic acid is oxidized with a peroxide to form an intermediate, N-phosphonomethyliminodiacetic acid-N-oxide, and thereafter, adding a metabisulfite compound in the presence of a molybdenum compound to convert the intermediate to N-phosphonomethylglycine.

US Patent:

50434756, Aug 27, 1991

Filed:

Jun 25, 1990

Appl. No.:

7/542995

Inventors:

Donald L. Fields - Manchester MO

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C07F 938

US Classification:

562 17

Abstract:

A process is provided for producing N-phosphonomethylglycine by the oxidation of N-phosphonomethyliminodiacetic acid with a peroxide to form an intermediate N-phosphonomethyliminodiacetic acid-N-oxide. Thereafter, the N-phosphonomethyliminodiacetic acid-N-oxide is converted to N-phosphonomethylglycine by adding a catalytic amount of a metal selected from the group consisting of iron, zinc, aluminum, vanadium and copper, or a compound selected from the group consisting of water-soluble vanadium compounds, ferrous salts and cuprous salts.

US Patent:

50774301, Dec 31, 1991

Filed:

Apr 15, 1991

Appl. No.:

7/684751

Inventors:

Donald L. Fields - Manchester MO

Assignee:

Monsanto Company - St. Louis MO

International Classification:

C07F 938

US Classification:

562 17

Abstract:

A process is provided for producing N-phosphonomethylglycine by the oxidation of N-phosphonomethyliminodiacetic acid with a peroxide to form an intermediate N-phosphonomethyliminodiacetic acid-N-oxide. Thereafter, the N-phosphonomethyliminodiacetic acid-N-oxide is converted to N-phosphonomethylglycine by adding a catalytic amount of a metal selected from the group consisting of iron, zinc, aluminum, vanadium and copper, or a compound selected from the group consisting of water-soluble vanadium compounds, ferrous salts and cuprous salts.