Sec 1 PREPARATION AND PHYSICAL PROPERTIES ■PREPARATION .Halogenation(Allylic Halogenation) ●Vith HX ●From alcohol ●Diazonium coupling(for aryl halide only） ■UseSec 1 PREPARATION AND PHYSICAL PROPERTIES PREPARATION Halogenation(Allylic Halogenation) With HX From alcohol Diazonium coupling (for aryl halide only) Use