aluminium trichloride in dichloromethane T=0 - 20°C; 1 h;

Iron (III) nitrate nonahydrate; 2,2,6,6-tetramethyl-piperidine-N-oxyl; oxygen; sodium chloride in toluene T=20°C; 3.3 h;

1: acetyl chloride With polystyrene supported sodium selenide in tetrahydrofuran; N,N-dimethyl-formamide T=0 - 25°C; 4.5 h; 2: Kupfer-(p-brom-phenyl)-acetylid in N,N-dimethyl-formamide T=80°C; 14 h;