| abstract |
The present invention is related to a method for the synthesis of an ammoalkylenephosphomc acid or its phosphonate esters comprising the following steps: a) forming, in the presence of an aldehyde or ketone and an acid catalyst, a reaction mixture by mixing a compound comprising at least one HNR'R 2 moiety or a salt thereof, with a compound having one or more P-O-P anhydride moieties, said moieties comprising one P atom at the oxidation state (+IP) and one P atom at the oxidation state (+IP) or (+V), wherein the ratio of moles of aldehyde or ketone to N-H moieties is 1 or more and wherein the ratio of N-H moieties to P-O-P an - hydride moieties is 0.3 or more and, b) recovering the resulting ammoalkylenephosphomc acid comprising compound or its pilosphonate esters. |