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01387 am a22001573u 4500 |
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|a dc
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|a Ramli, Zainab
|e author
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|a Prasetyoko, Didik
|e author
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|a Endud, Salasiah
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|a Friedel-Crafts Acylation Of Anisole Catalysed By H-Zeolite Beta Of Crystalline Rice Husk Ash
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|b Penerbit UTM Press,
|c 2002-06.
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| 856 |
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|z Get fulltext
|u http://eprints.utm.my/id/eprint/1346/1/JT36C3.pdf
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|a The reactivity of H-Beta zeolite, synthesised directly from crystalline rice husk ash in various SiO2/Al2O3 gel ratios, was studied in the Friedel-Crafts acylation of anisole with propionic anhydride. Reactions were carried out in a batch reactor at various times and reaction temperatures in order to obtain the optimum acylation condition. Products identified by gas chromatography showed that p-methoxypropiophenone is the main product with propionic acid as the main side product. Hbeta catalyst from the SiO2/Al2O3 = 27 gel ratio gave the highest activity, with anisole conversion of 88.9% and product selectivity toward p-ethoxypropiophenone of 75.3%. The optimum acylation condition was taken at 100°C reaction temperature in 4 hour reaction. Study showed that acylation reaction follows the electrophilic aromatic substitution mechanism catalysed by Brønsted acid sites of H-Beta zeolite.
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|a en
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|a QD Chemistry
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