For 10 points, name this metal that forms patinas , symbolized Cu.
This element is used as a catalyst in a reaction that, via oxidative coupling of arylboronic acids with atmospheric nitrogen and oxygen, creates carbon heteroatom bonds. A similar reaction using this element creates biaryl compounds from aryl halides at high temperature, but can also be used on a phenol with aryl halides to make diaryl ether. In addition to its use in Chan-Lam coupling and the Ullmann reaction, this element is used with lithium in a reagent that can replace (*) halide groups with an R group and this metal is used in the A type of a solution that can determine whether a carbonyl is an aldehyde or ketone. In addition to its use in Gillman's reagent, this metal's sulfate is used in Fehling's solution. Its aqueous solution is blue. For 10 points, name this metal that forms patinas , symbolized Cu.
This element is used as a catalyst in a reaction that, via oxidative coupling of arylboronic acids with atmospheric nitrogen and oxygen, creates carbon heteroatom bonds.
copper [accept Cu before mention]