[OH:1][CH2:2][P:3]([OH:5])[OH:4].Cl.[CH2:7]([NH:14][CH2:15][C:16]([OH:18])=O)[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1.[CH2:19]=O>Cl>[CH2:7]([NH:14][CH2:15][C:16]([CH2:19][P:3]([CH2:2][OH:1])(=[O:5])[OH:4])=[O:18])[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1The procedure of Example 1 is carried out starting from 9.6 g (0.1 mole) of hydroxymethylphosphonous acid ##STR8## 20.2 g (0.1 mole) of N-benzylglycine hydrochloride, 100 ml of conc. hydrochloric acid and 31.6 g of 38% formaldehyde solution. The reaction mixture is concentrated by rotary evaporation, yielding 22.7 g (88%) of (N-benzylglycylmethyl)hydroxymethylphosphinic acid of the formula ##STR9## as a glassy substance which sinters at 92° C., becomes liquid at 118° C., and decomposes at 135° C.
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