1: With polystyrene-based selenenyl bromide resin in dichloromethane T=0 - 25°C; 0.333333 h; 2: With dihydrogen peroxide in tetrahydrofuran T=25°C; 0.333333 h; Further stages.;

potassium carbonate in N,N-dimethyl-formamide T=130°C; 8 h;

pyridine; trichlorophosphate; benzene Erhitzen des Reaktionsprodukts unter vermindertem Druck;

potassium carbonate; potassium iodide in acetone 20 h; Heating;

1: 1.) Li, n-bromobutane / 1.) ether, 2.5 h, 2.) ether, reflux, 20 h 2: 455 mg / diethyl ether / 3 h / Heating 3: NaH / dimethylsulfoxide / 20 h / Ambient temperature 4: K2CO3 / acetone / 11 h / Heating View Scheme