Preparation and X-ray structure of a (catecholato)copper(II) complex with a Schönberg adduct

The reaction of metallic copper, triphenylphosphine and 1,2-naphthoquinone leads to the copper(II) catecholate complex bis(4-triphenylphosphoniono)(naphthalene-1,2-dioxolato)copper(II), the first example of a metal complex ligated by a Schönberg adduct.