Aryl diazonium salts react with salts of this element to produce aryl halides in the Sandmeyer reaction.
An acetylide of this element reacts with a palladium complex in the transmetallation step of the Sonogashira coupling. Aryl diazonium salts react with salts of this element to produce aryl halides in the Sandmeyer reaction. Reduction of this element from its plus-two oxidation state to plus-one is used as a test for sugars in Fehling's solution, which produces a brick-red precipitate. The pentahydrate salt of this element's sulfate has a bright blue colour. Corrosion of this element gives the bright-green pigment verdigris, and it is alloyed with zinc in brass and with tin in bronze. For 10 points, name this highly-conductive element with symbol Cu.
An acetylide of this element reacts with a palladium complex in the transmetallation step of the Sonogashira coupling.
copper [or Cu early]