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The Stereoselective Formation of trans‐Cumulene through Dehalogenative Homocoupling of Alkenyl gem‐Dibromides on Cu(110)

Stereoselective synthesis of geometrically pure isomers is challenging and important in a variety of chemistry related disciplines and applications. The recently developed on‐surface synthesis strategy provides us opportunities in the fabrication of specific nanostructures which remain challenging by conventional solution chemistry. In this work, we choose alkenyl gem‐dibromides as molecular precursors, and demonstrate the formation of specific trans‐cumulene products via C−C couplings on Cu(110). This study supplements the database of on‐surface synthesis strategies by introducing the alkenyl gem‐dibromide group on the surface. More importantly, it provides a way to stereoselective synthesis of specific isomers involving C−C double bonds, which may be of substantial utility in stereochemistry.