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