1: 98 percent / m-chloroperbenzoic acid / CH2Cl2 / 1.5 h / 0 °C 2: 52 percent / lithium aluminium hydride / diethyl ether 3: 64 percent / sodium dichromate dihydrate/concentrated sulfuric acid / diethyl ether; H2O / Ambient temperature View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: 91 percent / p-toluenesulfonic acid / ethanol / Heating<br />2: 1) n-BuLi / 1a) -45 deg C, b) 1-2h, RT, 2a) 0 deg C, 30 min., b) RT, several hours<br /> <br /> &nbsp;