Three‐Component [2+2+2] Cycloaddition of Carboryne, Unactivated Alkene, and Alkyne via Zirconacyclopentane Mediated by Nickel: One‐Pot Synthesis of Dihydrobenzocarboranes

Mix three—get one: The complexation of a transition-metal center to an olefin or alkyne can significantly modify its reactivity, which makes the selective coupling of different alkenes or alkynes to carboryne possible. An example of a three-component [2+2+2] cycloaddition reaction of carboryne with unactivated alkene (see scheme, blue) and alkyne (red) mediated by zirconium and nickel complexes is described.