sodium hydroxide; dihydrogen peroxide; thexylchloroborane; benzoyl chloride 1) THF, 25 deg C, 2 h; 2) ether, -78 deg C; 3) THF, 45 deg C, 1 h; 4) 45 deg C, 12 h; 5) 40 - 45 deg C, room temperature (2 h); Yield given. Multistep reaction;