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It has been shown by 1H NMR spectroscopy that alkylmethylammonium salts of monomethyl esters of phosphonic acids having the general formula [RN+H2CH3][−OPH(O)(OCH3)] are unstable. At ambient temperature these salts convert into the corresponding alkylammonium salts [RN+H3][−OPH(O)(OCH3)]. The effect of different substituents R on the stability of these alkylammonium cations is discussed.
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Georgiev et al. (1994) studied this question.
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