1: 98 percent / potassium hydroxide, copper sulfate, zinc dust / 20 h / Heating 2: 1.) acetic anhydride, zinc chloride, 2.) potassium dichromate / 1.) reflux, acetic acid, 2 h, 2.) +H2O, reflux, 1 h 3: dimethyl sulfoxide, sodium hydride 4: LiAlH4 / tetrahydrofuran / 2 h / cooling 5: 96 percent / HCl, SnCl2 6: 84 percent / BBr3 / benzene / 0.75 h / Heating; deoxygenated solvents View Scheme

1: 98 percent / potassium hydroxide, copper sulfate, zinc dust / 20 h / Heating 2: 1.) acetic anhydride, zinc chloride, 2.) potassium dichromate / 1.) reflux, acetic acid, 2 h, 2.) +H2O, reflux, 1 h 3: dimethyl sulfoxide, sodium hydride 4: LiAlH4 / tetrahydrofuran / 2 h / cooling 5: 96 percent / HCl, SnCl2 6: 84 percent / BBr3 / benzene / 0.75 h / Heating; deoxygenated solvents 7: 85 percent / pyridine / Ambient temperature View Scheme