1: With dimethylsulfide borane complex in tetrahydrofuran 2 h; Heating / reflux; 2: With hydrogenchloride; water in tetrahydrofuran; methanol T=20°C; 0.5 h; 3: With ammonia in methanol

phosphorus; hydrogen bromide T=150°C; Erwaermen des Reaktionsprodukts mit aethanol. NH3;