High oxophilicity of metal carbenes formed in rhodium(II) perfluorobutyrate catalysed decomposition of diazo carbonyl compounds allows selective ylide generation from methyl prop-2-yn-1-yl ethers with resulting allene production through the [2,3]-sigmatropic rearrangement.
M. P. Doyle, V. Bagheri and E. E. Claxton, J. Chem. Soc., Chem. Commun., 1990, 46 DOI: 10.1039/C39900000046
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