Silalactones: The copper‐catalyzed reaction of internalalkynes with (dimethylphenylsilyl)pinacolborane (Me2PhSi‐B(pin)) as the silicon source and CO2 at atmospheric pressure afforded silalactones selectively in good to high yields. The silalactones can be used as substrates for the Hiyama cross‐coupling reaction as demonstrated for one substrate.