Ethyl copper (CuC<sub>2</sub>H<sub>5</sub>) is an organocopper compound consisting of copper in its +1 oxidation state (cuprous) bound to an ethyl group. It can be generated by transmetallation by the reaction of copper(I) acetate with tetraethyl lead:
Methyl copper was obtained from methyl lithium and copper(I) iodide at low temperature.
A copper ethyl complex has been characterized by X-ray crystallography.