1: conc. hydrochloric acid / aq. ethanol / 0.5 h / Ambient temperature 2: 37 percent / p-toluenesulfonic acid, acetic acid / 24 h / Heating View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: 1.) n-BuLi / 1.) THF, hexane, -78 deg C, 1 h, 2.) THF, hexane, a) -78 deg C, 0.5 h, b) RT, 0.5 h<br />2: 1.) n-BuLi / 1.) THF, hexane, -78 deg C, 2 h, 2.) THF, hexane, RT<br /> <br /> &nbsp;