Phosphorus as the Substituent

The field of allenes bearing phosphorus is dominated by sigmatropic rearrangements (see Section 1.3.1). Nevertheless, some examples of prototropic rearrangements are known. 

If one considers a TMS group to be equivalent to a proton, a recent paper describes the formation of a phosphanyl-substituted allene by a keto-enol tautomer-ization-like silyl migration [346], 

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