Brönsted Acidic Ionic Liquids as Efficient and Recyclable Catalysts for the Carbonylation of Formaldehyde
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Methyl glycolate (MG), as a precursor to ethylene glycol (EG), was synthesized by an efficient and eco-friendly procedure of one-pot, two-step, sequential reaction, including carbonylation and esterification from HCHO with Brönsted acidic ionic liquids (BAILs) as catalysts. MG was obtained in high yield under mild conditions. In addition, the catalyst could be recycled eight times after separating the unreacted materials and products from the reaction system by distillation under vacuum and no significant decrease in catalytic activity was observed.
KeywordsFormaldehyde Carbonylation Methyl glycolate Ethylene glycol Ionic liquids
This study was supported by National Basic Research Program of China (973 Program) 2011CB201404 and the Key Project of the National Twelfth-Five Year Research Program of China 2011BAE17B00.
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