Preparation and characterization of polyethylene glycol-bis(N- methylimidazolium) dihydroxide as a basic phase-transfer catalyst and its application in Knoevenagel condensation under aqueous media
محل انتشار: نشریه آسیایی شیمی سبز، دوره: 3، شماره: 2
سال انتشار: 1396
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 348
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شناسه ملی سند علمی:
JR_AJGC-3-2_002
تاریخ نمایه سازی: 22 اردیبهشت 1397
چکیده مقاله:
A basic phase-transfer catalyst ([PEG(mim)2][OH]2) was prepared from the reaction of polyethylene glycol-bis(N-methylimidazolium) dibromide and sodium hydroxide dissolved in water at ambient temperature. The obtained white solid was used as an efficient basic phase-transfer catalyst in Knoevenagel condensation reactions between aromatic aldehydes and active methylene compounds in water at room temperature. The reaction is done without side products and in the presence of trace amounts of the catalyst gives the corresponding products with high yields. The phase-transfer catalyst could be successfully reused without significant decrease in its activity for at least five cycles.
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نویسندگان
Fariba Poyafar
Department of Chemistry, Payame Noor University (PNU), Tehran, Iran
Mehdi Fallah-Mehrjardi
Department of Chemistry, Payame Noor University (PNU), Tehran, Iran
Sayed Hossein Banitaba
Department of Chemistry, Payame Noor University (PNU), Tehran, Iran