Process for the preparation of N-(phosphonomethyl)glycine by oxidizing N-substituted N-(phosphonomethyl)glycine
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United States of America Patent
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May 15, 2001
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N/A
app pub date -
Mar 5, 1999
filing date -
Feb 12, 1998
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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.
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