Vinylsilanes are important synthetic tools in organic chemistry. 1 Although various methodologies for their preparation have been reported, there have been few reports on a successful, widely useful stereoselective olefination of acylsilanes. 2 Recently, we reported a stereoselective olefination of acylsilanes, via torquoselective electrocyclic ring-opening of β-lactone enolates derived from ynolates, giving (Z)-β-trialkylsilyl-α,β-substituted acrylates, that is, multisubstituted ...