1: 92 percent / lithium aluminum hydride / tetrahydrofuran / Heating 2: 89 percent / HgCl2 / acetonitrile; H2O / 20 °C 3: 100 percent / sodium borohydride, cerium(III) chloride / methanol / -78 °C 4: 92 percent / triphenylphosphine, diethyl azodicarboxylate / tetrahydrofuran / 20 °C 5: 1) 9-borabicyclo<3.3.1>nonane, 2) H2CrO4 / 1) THF, 20 deg C, 2) ether, 0 -> 20 deg C 6: K2CO3 / acetone / 20 °C View Scheme