2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride in toluene T=110°C;

2,2,6,6-tetramethyl-1-piperidinyloxy, free radical; trimethylsilylazide; oxygen in acetonitrile T=80°C; P=760.051 Torr; 36 h; Schlenk technique; regioselective reaction;