Process for the preparation of N-(phosphonomethyl)glycine by oxidizing N-substituted N-(phosphonomethyl)glycine
US6232494A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1999 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | Mar 5, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention is directed to an improved process for the preparation of N-(phosphonomethyl)glycine (i.e., "glyphosate"), a salt of N-(phosphonomethyl)glycine, or an ester of N-(phosphonomethyl)glycine. The process comprises combining an N-substituted N-(phosphonomethyl)glycine reactant with oxygen in the presence of a noble metal catalyst. The N-substituted N-(phosphonomethyl)glycine reactant has formula (V): ##STR1## wherein R.sup.1 and R.sup.2 are independently selected from the group consisting of hydrogen, halogen, --PO.sub.3 R.sup.12 R.sup.13.sub.1, --SO.sub.3 R.sup.14, --NO.sub.2, hydrocarbyl, and substituted hydrocarbyl other than --CO.sub.2 R.sup.15 ; and R.sup.7, R.sup.8, R.sup.9, R.sup.12, R.sup.13, R.sup.14, and R.sup.15 are independently selected from the group consisting of hydrogen, hydrocarbyl, substituted hydrocarbyl, and an agronomically acceptable cation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.