1: sodium dithionite, sodium bicarbonate / Adogen 464 / cyclohexane; H2O / 3.5 h / Heating 2: cc HCl / methanol / 5 h / Ambient temperature 3: 97 percent Chromat. / 4-dimethylaminopyridine / triethylamine View Scheme

With  sodium dithionite; sodium hydrogencarbonate; adogen 464 in  cyclohexane; water 3.5 h;  Heating;  Yield given;