1: 79.5 percent / Jones reagent / acetone / 1 h 2: 92.5 percent / sodium methoxide / benzene / 13 h / Ambient temperature 3: 1.) 2,3-dichloro-5,6-dicyano-1,4-benzoquinone, 2.) conc aq. HCl / 1.) benzene, room temperature, 30 min, 2.) 22 h 4: 74 percent / anhydrous potassium carbonate / dimethylformamide / 2.5 h 5: 98 percent / toluene / 0.75 h 6: 49 percent / 10percent aq. HCl / diethyl ether / 25 h View Scheme