diisobutylaluminium hydride; zirconium tetrachloride T=60°C; 5 h;

sodium hydroxide; Et3N-BH3; dihydrogen peroxide 1.) reflux, 3 h then 180 deg C, 16 h; 2.) tetrahydrofuran, -10 deg C to 0 deg C;

sodium hydroxide; Et3N-BH3; dihydrogen peroxide 1.) reflux, 3 h; 2.) tetrahydrofuran, -10 to 0 deg C;

lithium aluminium tetrahydride; mercury(II) diacetate; bromine; acetic acid 1.) 15 deg C, 0.5 h; 2.) ether, 2 h; Yield given. Multistep reaction. Yields of byproduct given;