3-Aryl-2-propenyl propargyl ethers (1) undergo the [1,2](and [1,4]) sigmatropic rearrangement periselectively on treatment with BunLi at –78 °C, whereas the silylated derivatives (2) perform exclusively the [2,3]-Wittig rearrangement.
K. Hayakawa, A. Hayashida and K. Kanematsu, J. Chem. Soc., Chem. Commun., 1988, 1108 DOI: 10.1039/C39880001108
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