Preparation of N-phosphonomethylglycine
US3956370A · kind A · utility
37Cited by
3References
3Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 2, 1973 |
| Grant date | May 11, 1976 |
| Priority date | — |
| Expiry date | Jul 2, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/3813
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process of preparing the herbicide N-phosphonomethylglycine which comprises reacting an N-substituted glycine derivative of the formula: ##EQU1## wherein R.sup.1 is a hydrogen atom or an esterifying group, Ar is an aryl radical, and R.sup.2 and R.sup.3 each stand for a hydrogen atom or an aryl radical, with formaldehyde and phosphorous acid in an acidic aqueous medium to give an N-substituted N-phosphonomethylglycine derivative of the formula: ##EQU2## and thereafter reacting the said N-substituted N-phosphonomethylglycine with hydrobromic or hydriodic acid to remove the N-substituent, and recovering N-phosphonomethylglycine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.