Abstract
The preparation of α-aminoalkanephosphonic acids from triphenyl phosphite, an aldehyde, and ethyl or benzyl carbamate in glacial acetic acid, followed by hydrolysis, is accompanied by the formation of the corresponding α-hydroxyphosphonic acid. Reaction in toluene, using boron trifluoride-etherate as catalyst, affords an alternative reparative procedure but does not prevent the formation of α-hydroxyphosphonic acid. 31P nmr reveals the presence of numerous intermediates. The reactions are discussed.
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