GaCl3 Promoted one-step α,α-diethynylation and α,α-diethenylation reactions of silyl enol ethers

In the presence of GaCl3 and 2,6-di(tert-butyl)-4-methylpyridine, α-monosubstituted silyl enol ethers were α,α-diethynylated with a chlorosilylacetylene in one step. An analogous reaction using a silylacetylene gave α,α-diethenylated ketones.