Divalent palladium catalysed tandem addition of lithium halides to alkynes and α,β-unsaturated carbonyl compounds gives δ-halo-γ,δ-unsaturated carbonyls in high yield and good stereoselectivity, the key step being the halide assisted protonolysis of the carbon–palladium bond following halopalladation and carbon–carbon double bond insertion.
Z. Wang and X. Lu, Chem. Commun., 1996, 535 DOI: 10.1039/CC9960000535
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