对羟基苯乙酮合成工艺优化
Optimization of the synthesis process of p-hydroxyacetophenone
p-Hydroxyacetophenone was synthesized via the Fries rearrangement of phenyl acetate intermediates.Phenol,acetic anhydride,and anhydrous magnesium chloride were used as raw materials to synthesize phenyl acetate,followed by the use of silica-supported aluminum chloride (SiO2-AlCl3) as the catalyst for the rearrangement.The morphology,structure,and thermal stability of the catalyst were characterized by scanning electron microscopy (SEM),Fourier-transform infrared spectroscopy (FT-IR),and thermogravimetric analysis (TGA).The effects of reaction temperature,catalyst amount,reaction time,and solvent on the yield and selectivity of the product were investigated.The results showed that when the molar ratio of phenol,acetic anhydride,and anhydrous magnesium chloride was 1∶1.1∶0.015,and the reaction was carried out at 100℃,the yield of phenyl acetate was 98.32%,selectivity was 98.50% and the HPLC purity was 99.07%.Under the reaction conditions with 10 wt% to 20% SiO2-AlCl3,nitrobenzene as solvent,and a molar ratio of n(phenyl acetate)∶n(nitrobenzene)=1∶1.2,at 80℃ for 6 hours,the para/ortho ratio of hydroxyacetophenone was 9.12.
乙酸苯酯 / 对羟基苯乙酮 / 选择性 / Fries重排 / SiO2-AlCl3
phenyl acetate / p-hydroxyacetophenone / selectivity / Fries rearrangement / SiO2-AlCl3
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