Method of making phosphorus-containing compounds and...

Details Method of making phosphorus-containing compounds and... Method of making phosphorus-containing compounds and...

2005-03-08

2005-03-08

Richter, Johann (Department: 1626)

Plant protecting and regulating compositions

Plant growth regulating compositions

Organic active compound containing

C562S017000, C558S108000, C558S111000, C558S145000, C558S169000

Reexamination Certificate

active

06864218

ABSTRACT:
A process for oxidizing a hydroxymethylphosphonic acid compound to produce a formylphosphonic acid compound is described. The oxidation reaction is carried out in the presence of an oxidant and a catalyst. For example, hydroxymethylphosphonic acid (HMPA) is oxidized by oxygen or hydrogen peroxide in the presence of a copper-containing catalyst to give formylphosphonic acid (FPA). Formylphosphonic acid can then be reacted with glycine to produce a condensation product which, upon hydrogenation, yields glyphosate. Glyphosate can be incorporated into various formulations for use as a herbicide. In addition to glycine, formylphosphonic acid can also be reacted with ammonia, ethanolamine, or other primary amines to form a precursor compound, which can be converted to glyphosate.

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Search Report, Oct. 4, 2002.

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