pyridine; benzeneselenenyl chloride; dihydrogen peroxide 1.) CH2Cl2, 0 deg C, 5 h, 2.) CH2Cl2, 10 min; Yield given. Multistep reaction;

1: NaH / 1.) DMF, RT, 2 h, 2.) 100-110 deg C, 2.5 h 2: 50 percent / conc. HCl / 96 h / Heating 3: 75 percent / LiAlH4, 2-Propanol / diethyl ether / 3 h / -60 - -50 °C / Other temperatures, other reaction times, different reactant ratios View Scheme

1: NaH / 1.) DMF, RT, 2 h, 2.) 100-110 deg C, 2.5 h 2: 50 percent / conc. HCl / 96 h / Heating View Scheme

sodium hydroxide T=120°C;

1: phosphoryl chloride; benzene 2: diethyl ether; benzene View Scheme

sulfuric acid T=20°C;

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