1.1: 93 percent / aq. acetic acid / 1.5 h / 65 - 70 °C 2.1: 82 percent / triethylamine / CH2Cl2 / 1.5 h / 20 °C 3.1: 20.9 percent / BF3*OEt2 / tetrahydrofuran / 60 h / 45 - 50 °C 4.1: 85 percent / aq. sodium hydroxide / methanol / 80 °C 5.1: 93 percent / pyridine 6.1: 95 percent / sodium hydride in 60 percent oil / tetrahydrofuran / 0 - 20 °C 7.1: 69 percent / magnesium bromide etherate / diisopropyl ether / 20 °C 8.1: 46 percent / zinc powd. / ethanol / Heating 9.1: sodium borohydride,; BF3*OEt2,; 9-BBN / tetrahydrofuran / 25 - 70 °C 9.2: 43 percent / aq. NaOH,; 30 percent H2O2 / 0 °C View Scheme