1: 86 percent / sodium bicarbonate / 120 h / 25 °C 2: 91 percent / zinc powder / tetrahydrofuran / 6 h / 65 °C 3: 99 percent / sodium hydroxide / methanol; H2O / 48 h 4: 83 percent / sodium carbonate, sodium tungstate, 40percent peracetic acid / H2O; methanol 5: 91 percent / 1) sodium methoxide, 2) sodium borohydride / methanol / 1) -30 degC, 20min, 2) 25 degC, 6h 6: 84 percent / paraformaldehyde, boron trifluoride etherate / H2O; acetone / 120 h / Ambient temperature View Scheme

1: 86 percent / sodium bicarbonate / 120 h / 25 °C 2: 91 percent / zinc powder / tetrahydrofuran / 6 h / 65 °C 3: 99 percent / sodium hydroxide / methanol; H2O / 48 h 4: 83 percent / sodium carbonate, sodium tungstate, 40percent peracetic acid / H2O; methanol 5: 91 percent / 1) sodium methoxide, 2) sodium borohydride / methanol / 1) -30 degC, 20min, 2) 25 degC, 6h 6: 11 percent / paraformaldehyde, boron trifluoride etherate / H2O; acetone / 120 h / Ambient temperature View Scheme