1: in acetonitrile T=80°C; 2 h; 2: With 1,4-diaza-bicyclo[2.2.2]octane; 4-hydroxy-2,2,6,6-tetramethyl piperidinyloxy, free radical; oxygen; copper(l) chloride in acetonitrile T=80°C; 0.5 h;

1: acetonitrile / 2 h / 80 °C 2: 1,4-diaza-bicyclo[2.2.2]octane; 4-hydroxy-2,2,6,6-tetramethyl piperidinyloxy, free radical; oxygen; copper(l) chloride / acetonitrile / 6 h / 80 °C View Scheme