trichlorophosphate 1.5 h; O deg C to room temp.;

benzeneselenic anhydride in dichloromethane

1: n-butyllithium, TMEDA / tetrahydrofuran; hexane / 1 h / -78 °C 2: 82 percent / tetrahydrofuran; hexane; various solvent(s) / -78 - 25 °C 3: 78 percent / phenylselenic anhydride / CH2Cl2 View Scheme

hydrogenchloride; diethyl ether anschliessend Hydrolysieren;

Yield given. Multistep reaction;

sodium hydroxide; silver(l) oxide

1: NH2OH*HCl, NaOH / ethanol; H2O / 0.33 h / Heating 2: Raney Ni alloy, 2 N aq. NaOH / ethanol / 1 h / Ambient temperature 3: 1.) oxygen, tetraphenylporphine, 2.) triphenylphosphine / 1.) CH2Cl2, -70 deg C, irradiation, 2 h, 2.) -70 deg C, 10 min View Scheme