pyridine; copper diacetate in dichloromethane T=20°C; 24 h;

1: ethene With polystyrene-bound selenenyl bromide in tetrahydrofuran T=20°C; 0.0833333 h; 2: 4-tert-butyl-phenol With tetra-(n-butyl)ammonium iodide; potassium carbonate; potassium iodide in N,N-dimethyl-formamide T=20°C; 10 h; 3: With dihydrogen peroxide in tetrahydrofuran T=20°C; 0.5 h;

potassium hydroxide