1: With didodecanoyl peroxide in 1,2-dichloro-ethane 2 h; Inert atmosphereReflux; 2: With acetic acid in water; 1,2-dichloro-ethane 0.5 h; Inert atmosphere; 3: With tetrabutyl ammonium fluoride in water; 1,2-dichloro-ethane 1 h; Inert atmosphere; regioselective reaction;