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; 18 h; Sealed tube; Overall yield = 96 percent;

<b>Multi-step reaction with 2 steps<br /> </b>1: sodium azide / acetonitrile; water / 20 &deg;C<br />2: palladium diacetate; tert.-butylhydroperoxide / 24 h / 80 &deg;C / |Schlenk technique<br /> <br /> &nbsp;