Tin- and Germanium-Substituted Enol Ethers from Fischer Carbene Complexes and Group 14 Vinyl Derivatives

Trialkyltin- or trialkylgermanium-substituted enol ethers 5 and 2-alkoxy-1,3-butadienes 7 have been prepared by the reaction of Fischer carbene complexes 1−3 and 6 with vinylstannanes and -germanes 4. The opening of the metallacyclobutane intermediate by metalloid migration has been shown by using a 2,2-dideuteriated olefin.