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Acetylation Reaction of the 2Methoxynaphthalene Catalysed by Phosphotungstic Acids
Shi Zhengbao, Chen Shuqing, Chen Ping
The catalytic properties of phosphotungstic acids for the Friede1Crafts acylation of 2methoxynaphthalene(MN) with aceticanhydride (AA) were investigated.The effect of various reaction conditions, such as reaction temperature, ratio of reactants, reaction time and catalyst dosage on conversion of 2methoxynaphthalene and the selectivity to main product were studied. The results show that 2methoxy1acetonaphthone was main priority products in the acylation reaction of 2methoxynaphthalene. The optimal reaction conditions were as follows: 0.08 g H3PW12O40 as catalyst, reaction time 3 h, reaction temperature 100 ℃, molar ratio of 2methoxynaphthalene to acetic anhydride 1∶2. Under these conditions, the conversion of 2methoxynaphthalene is 83.32%and the selectivity is up to 91.39% .
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