in diethyl ether T=0°C; 3 h;

benzene-selenenyl bromide; dihydrogen peroxide; silver fluoride 1.) CH2Cl2, from 5 to 10 deg C, sonication, 1.5 h, 2.) CH2Cl2, sonication, 30 min; Yield given. Multistep reaction;

hydrogenchloride; triethylamine 1) THF; 2) 0 deg C, 1.5 h; 3) benzene, 20 deg C, 16 h; Yield given. Multistep reaction. Yields of byproduct given;