1: 240 mg / H2 / 10 percent palladium on charcoal / ethyl acetate / 0.75 h 2: 3.3 g / toluene-p-sulphonic acid / benzene / 1 h / Heating 3: 900 mg / carbon tetrachloride, pyridine, triphenylphosphine / 3 h / Heating 4: 650 mg / tributyltin hydride, 2,2-azobisisobutyronitrile / benzene / 3 h / Heating 5: concd. sulphuric acid / ethanol; H2O / 0.17 h / Heating 6: 1.) sodium hydride/dimethyl sulphoxide / 1.) rt., 1 h; 2.) THF, rt., 3 h: 60 deg C, 1 h 7: lithium aluminium hydride / tetrahydrofuran / 1 h / Ambient temperature View Scheme