toluene-4-sulfonic acid in dichloromethane

1: 1.) n-BuLi / 1.) hexane, THF, -15 deg C, 45 min; 2.) hexane, THF, from -40 deg C to r.t. 2: lithium aluminium hydride / diethyl ether / 24 h / Heating 3: 77 percent / p-TsOH / CH2Cl2 / 36 h / Heating View Scheme