The thermal behaviour of 3-methylbut-2-enyl-diphenyl-(3-methylbut-2-enyl)phosphorane has been examined: unlike the carbon, nitrogen, oxygen, and sulphur analogues of this molecule only a small fraction of the rearrangement proceeds through the [3,2]-sigmatropic shift, the major pathway being a radical dissociation–recombination.
J. E. Baldwin and M. C. H. Armstrong, J. Chem. Soc. D, 1970, 631b DOI: 10.1039/C2970000631B
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