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Silylated 3-amino-propane-1-hydroxy-1,1-bisphosphonk acid and some of its N-alkyl derivatives undergo a thermally induced rearrangement which includes elimination of the amino substituent and migration of a phosphono group. The homologue 4-aminobutane-1-hydroxy-1,1-bisphosphonic acid is converted to pyrrolidine derivatives under the same conditions. The mechanism of the observed reactions is discussed.
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