Migration of Groups or Atoms Other than

Known examples of migrations in phosphorus chemistry are numerous and varied. 

Tautomerism nearly always involves the transfer of H atoms, but migrations of other atoms (not necessarily involving equilibria) can occur. Best known of these in phosphorus chemistry is probably the Arbusov transformation. Although this reaction may sometimes take place simply on heating (13.262) or even at room temperature (13.263), other reagents are usually involved (6.267) and (3.109) [8-10]. 

Nitrogen replaces carbon on the P atom in Beckmann-type rearrangements [11] (13.264) and in Lossens-type transformations [12] (13.265). 

Movement of alkyl can occur between 0 and N atoms as in Equations 13.266 and 7.327. In addition to these phosphazene-phosphazane rearrangements, there are also other transitions (7.507) and (7.511). 

Groups may transfer from P to C as in the transition (13.271), or in the reverse direction (13.272), [13] which can in turn be compared with the azide in Equation 13.273. 

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