62. P. Mangeney, A. Alexakis, J.F. Normant,
    “Diastereoselective conjugate addition to chiral α,β-ethylenic acetals”
    Tetrahedron Lett. 1986, 27, 3143-3146.

The phenyl copper reagent associated with Lewis acid (BP₃) reacts regio (SN₂′) and stereoselectively with chiral α,β ethylenic acetals.

PhCu,BF₃ reacts regio and stereoselectively with chiral α,β ethylenic acetals. 

DOI : 10.1016/S0040-4039(00)84737-1 

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