1: 90 percent / Jones reagent / acetone / 3 h / -10 °C 2: 96 percent Turnov. / 1,5-diazabicyclo<5.4.0>undec-5-ene / benzene / 18 h / Ambient temperature 3: 93 percent / lithium tri-s-butylborohydride / tetrahydrofuran / 0.5 h / -78 °C 4: 100 percent / pyridinium toluene-p-sulphonate / CH2Cl2 / 4 h / Ambient temperature 5: 90 percent / tetrabutylammonium fluoride / tetrahydrofuran / 5.5 h / 0 °C 6: 93 percent / pyridinium chlorochromate, sodium acetate / CH2Cl2 / 2 h / Ambient temperature 7: 99 percent / H2O, AcOH / tetrahydrofuran / 24 h / Ambient temperature View Scheme