N-sulfomethylglycinate, use in the preparation of herbicides of the glyphosate type
US5187292A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1992 |
| Grant date | Feb 16, 1993 |
| Priority date | — |
| Expiry date | Mar 2, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/3813
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to an N-sulfomethylglycinate of formula: EQU HO.sub.3 S--CH.sub.2 --NH--CH.sub.2 --COOR.sub.1 (I) COOR.sub.1 being a hydrolysable carboxylic ester group. It also relates to a process for the preparation of the compound of formula (I) consisting in putting in contact sulfur dioxide, formaldehyde, and glycine in the presence of a R.sub.1 OH alcohol, or glycinate. It also relates to the use of the compound of formula (I) for the preparation of herbicides of the glyphosate type of reaction with a phosphite or a phosphonate of formula (R.sub.2 O).sub.2 P (O) H in which (R.sub.2 O).sub.2 P is a hydrolysable phosphonic ester group, then optionally by a subsequent hydrolysis reaction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.