64. I. Marek, P. Mangeney, A. Alexakis, J.F. Normant,
    “Are allenes formed from propargylic ethers through a syn or anti displacement α”
    Tetrahedron Lett. 1986, 27, 5499-5502.

The copper catalyzed reaction of Grignard reagents with asymetric propargylic ethers leads to chiral allenes, with very high optical yield. This reaction proceeds through a syn addition to the triple bond followed by a syn or antiβ-elimination, according to the nature of the halogen of the Grignard derivative.

DOI : 10.1016/S0040-4039(00)85248-X 

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