Journal of the American Chemical Society p. 2292 - 2296 (1981)
Update date:2022-08-12
Topics:
Loewus, David I.
Sodium allylvinylphosphinate (1) rearranges thermally to sodium hydrogen pent-4-enephosphonate (3) in virtually quantitative yield.The reaction probably constitutes a phospho-Cope rearrangement and presumably proceeds by way of the monomeric metaphosphonate 2 as a reactive intermediate.The half-time for the reaction is 4.67 h in water at 193.6+/- 1.0 deg C and 6.03 h in ethanol.By contrast, ethyl allylvinylphosphinate reacts in ethanol to give a mixture of compounds; although some of the product expected for a phospho-Cope is present in the mixture, the rearrangement is slower than that of the anion by a factor of at least 16.The mechanistic implications of these facts are discussed.
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