thionyl chloride 2 h; Heating;

With  potassium tert-butylate in  diethyl ether; water 240 h;   

Multi-step reaction with 4 steps 1: 1.) n-BuLi, TMEDA / 1.) hexane, 0 - 4 deg C, 1 h; 2.) 1 h2: 57.4 percent / HCl, p-toluenesulfonic acid / methanol / Ambient temperature3: 1.) NaH / 1.) DMF, room temp., 1 h; 2.) reflux, 2 h4: 70.4 percent / KO-t-Bu / H2O; diethyl ether / 240 h  

Multi-step reaction with 3 steps 2: 1.) NaH / 1.) DMF, room temp., 1 h; 2.) reflux, 2 h3: 70.4 percent / KO-t-Bu / H2O; diethyl ether / 240 h