1: 70 percent 2: 34 percent / sodium hydrosulphite/conc. aq. HCl / 1.)r.t., 3 h 2.)80 deg C, 2 h 3: NaH / xylene / 1.)80 deg C, 3 h 2.)reflux, 8 h 4: 10percent aq. HCl View Scheme

1: 75 percent / ethanol / 4 h / Heating 2: 95 percent / Na2S2O4 / H2O; acetone / 1.5 h / Heating 3: 1.) 10percent KOH, Na2S2O4 / 1.) Me2CO, reflux, 0.5 h, 2.) reflux, 5 h View Scheme

1: 70 percent 2: 34 percent / sodium hydrosulphite/conc. aq. HCl / 1.)r.t., 3 h 2.)80 deg C, 2 h 3: 66 percent / NaH / xylene / 5 h / Heating 4: 70 percent / 20percent NaOH / ethanol / 3 h / Heating 5: 69 percent / 10percent aq. HCl View Scheme

1: 70 percent 2: 34 percent / sodium hydrosulphite/conc. aq. HCl / 1.)r.t., 3 h 2.)80 deg C, 2 h 3: NaH / xylene / 17 h / Heating 4: 10percent aq. HCl View Scheme

1: 70 percent 2: 34 percent / sodium hydrosulphite/conc. aq. HCl / 1.)r.t., 3 h 2.)80 deg C, 2 h 3: NaH / xylene / 3 h / Heating 4: 10percent aq. HCl View Scheme

in ethanol