in diethyl ether byproducts: CH4; (N2), dried solvents, -40°C, dropwise addn. of educts, 4 h, evapn. in vac. (same temp.), addn. of petroleum ether yield yellow pptn., cooled down to -78°C; filtration ppt., washing (pentane), dried (high vac.), elem. anal.;

lithium aluminium tetrahydride in diethyl ether T=20°C; 2 h;

1: 71 percent / 5 h / Irradiation 2: 83 percent / LiAlH4 / diethyl ether / 2 h / 20 °C View Scheme