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P-H bond.

Phosphonic acid can be alkylated via the Kabachnik-Fields reaction or Pudovik reaction to give aminophosphonate, which are useful as chelating agents. One example is the industrial preparation of nitrilotris(methylenephosphonic acid):

:NH₃ + 3 H₃PO₃ + 3 CH₂O -> N(CH₂PO₃H₂)₃

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