The Reaction of Fluorovinyl Ketones with Carbon Nucleophiles: A New General Route to α,β-Unsaturated Ketones

2,2-Difluorovinyl ketones are quite reactive toward carbon nucleophiles such as copper and magnesium reagents, of which reaction causes the stepwise substitution of two fluorine atoms with different groups via conjugate addition-elimination process to afford fully substituted α,β-unsaturated ketones in good yields.