A complex in which this element binds to both phosphorus atoms of bis·di·phenyl·phosphino·ferrocene is used to synthesize pinacol-based boronate esters. After this element coordinates to a double bond, a leaving group is expelled to make a tri·haptic pi-allyl complex in a popular method for asymmetric (15[1])alkylation. Chlorides of copper and this element are used in the industrial oxidation of ethylene to acet·aldehyde. A reaction that uses this element to synthesize (10[1])substituted (*) trans-alkenes from a (10[1])halide and an (10[1])alkene uses (-5[1])a migratory insertion and a beta-hydride elimination rather than the usual cycle (10[1]-5[1])of oxidative (10[1])addition, (10[1])transmetallation, (-5[1])and reductive (-5[1])elimination. (10[1])For (10[1])10 (10[1])points, name this (-5[2])element used in cross-couplings (10[1])developed by Negishi, (10[1])Heck, and Suzuki, a white metal used with platinum (10[1]-5[1])in catalytic converters. ■END■ (10[1])