L. Duhamel et al., A NEW ROUTE TO ALPHA,BETA-UNSATURATED ALDEHYDES USING THE CONDENSATION OF TRIMETHYLSILYL BETA-TRIMETHYLSILYL ENOL ETHERS WITH ALDEHYDES, Tetrahedron letters, 34(48), 1993, pp. 7745-7748
Beta-trimethylsilyl enol ethers 1 (Z) obtained from beta-bromoenolethe
rs 2 were condensed with aliphatic and aromatic aldehydes in the prese
nce of a catalytic quantity of trimethylsilyl triflate leading to ethy
lenic aldehydes 3 (E) with good yields (79-90%).