Abstract
Phosphotungstic heteropoly acid (PW) supported on various oxides (SiO2, TiO2, K-10 montmorillonite and γ-Al2O3) were synthesized and used as catalysts for Friedel–Crafts acylation of pyrene with acetic anhydride to 1-acetylpyrene for the first time. The as-prepared catalysts were characterized by specific surface area measurement, X-ray diffraction, infrared spectroscopy, and temperature programmed desorption of ammonia. SiO2-supported phosphotungstic heteropoly acid (PW/SiO2, 40 wt%) was found to be the most active catalyst in the acylation giving 91.8 % yield and 100 % selectivity for 1-acetylpyrene at reaction temperature of 60 °C under ambient pressure. The effect of PW Loading, PW/SiO2 amount, molar ratio of reactants, reaction temperature and reaction time on the catalytic acylation reaction were studied in detail to optimize the process parameters. The reusability of the PW/SiO2 catalyst was appraised, and the possible pathway for the production of the Friedel–Crafts acylation of pyrene with acetic anhydride catalyzed by phosphotungstic heteropoly acid was also discussed briefly.
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This work was supported in part by the National Natural Science Foundation of China (No. 20207003).
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He, MQ., Pan, AX., Xie, JM. et al. One-pot synthesis of 1-acetylpyrene over supported phosphotungstic heteropoly acid catalysts. Reac Kinet Mech Cat 108, 531–544 (2013). https://doi.org/10.1007/s11144-012-0524-3
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DOI: https://doi.org/10.1007/s11144-012-0524-3