Monsanto Technology LLC

Cedric Nicolas Leclercq

Patrick Pierre Notte

Sebastian Burck

A method for the synthesis of an aminoalkylenephosphonic acid or its phosphonate esters including the following steps: a) forming, in the presence of an aldehyde or ketone and an acid catalyst, a reaction mixture by mixing a compound having at least one HNRRmoiety or a salt thereof, with a compound having one or more P&#x2014;O&#x2014;P anhydride moieties, the moieties having one P atom at the oxidation state (+III) and one P atom at the oxidation state (+III) or (+V), wherein the ratio of moles of aldehyde or ketone to N&#x2014;H moieties is 1 or more and wherein the ratio of N&#x2014;H moieties to P&#x2014;O&#x2014;P anhydride moieties is 0.3 or more, and b) recovering the resulting aminoalkylenephosphonic acid having compound or its phosphonate esters.

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Limal, Belgium

Cedric Nicolas Leclercq