Abstract: With two-phase reactive system of CH3NO2/n-hexane,the hydroquinone of plastoquinone-9 was prepared at 43—45℃ by BF3·Et2O catalyzed Friedel-Crafts alkylation reaction of 2,3-dimethyl-1,4-hydroquinone,which was synthesized from 2,3-dimethylaniline via oxidation,reduction,and pure solanesol isolated from extractum tobacco.Then through a green oxidation of hydroquinone with air and a catalytic amount of FeCl3·6H2O,plastoquinone-9 was synthesized in good yield and high selectivity.