copper(I) thiophene-2-carboxylate; oxygen; triphenylphosphine; 2,2,2-trimethylacetic acid in dimethyl sulfoxide T=130°C; P=760.051 Torr; 23 h;

[2,2']bipyridinyl; copper(l) iodide; oxygen in N,N-dimethyl acetamide T=140°C; 24 h; Sealed tube; Overall yield = 96 percent;