1: 90 percent / methanol / 10 h / Ambient temperature 2: 94 percent / lithium aluminium hydride / tetrahydrofuran / 0.5 h / 0 °C 3: 1.) boron trifluoride etherate, 2.) p-toluenesulfonic acid / 1.) acetone-water, r.t, 2 h, 2.) r.t, 12 h. 4: 78 percent / aqueus sodium hydroxide / ethanol / 6 h / Heating View Scheme

2: 1.) Brockmann I alumina, 2.) potassium dichromate, H2SO4, tetrabutylammonium hydrogen sulphate / 1.) 24 h, r.t, 2.) CH2Cl2, -5 deg C, 3 h View Scheme

potassium dichromate; aluminum oxide; sulfuric acid; tetra(n-butyl)ammonium hydrogensulfate 1.) 24 h, r.t, 2.) CH2Cl2, -5 deg C, 3 h; Yield given. Multistep reaction;