Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 814-94-8, is researched, SMILESS is O=C([O-])C([O-])=O.[Sn+2], Molecular C2O4SnJournal, Article, ChemSusChem called A Bronsted Acidic Ionic Liquid as an Efficient and Selective Catalyst System for Bioderived High Molecular Weight Poly(ethylene 2,5-furandicarboxylate), Author is Qu, Xiao-ling; Jiang, Min; Wang, Bing; Deng, Jin; Wang, Rui; Zhang, Qiang; Zhou, Guang-yuan; Tang, Jun, the main research direction is bronsted acidic ionic liquid catalyst bioderived polyethylene furandicarboxylate; ecofriendly bioderived polyester polyfuran ionic liquid catalyst green chem; Brønsted acids; biomass valorization; hydrogen bonding; ionic liquids; polymers.Product Details of 814-94-8.
Green synthesis of bioderived high-mol.-weight poly(ethylene 2,5-furandicarboxylate) (PEF) over metal-free catalysts is a significant challenge. This study focuses on PEF prepared from ethylene glycol and 2,5-furandicarboxylic acid (FDCA) through a direct esterification method with ecofriendly metal-free ionic liquids (ILs) as catalysts. The catalytic activities of a series of imidazolium cations in the presence of various anions are systematically investigated and found to be mainly governed by the anions. Among the ILs studied, 1-ethyl-3-methylimidazolium tetrafluoroborate ([C2MIM]BF4) is identified as the best catalyst, showing excellent catalytic activity, selectivity, and stability, even at low catalyst loadings (0.1 mol % w.r.t. FDCA). Optimization of the polymerization parameters enables [C2MIM]BF4-catalyzed production of PEF with a high number-average mol. weight (Mn=5.25×104 g mol-1). The relationship between Bronsted acidity and catalytic activity is also investigated and the results show that the trend in catalytic activity is in good agreement with that in Bronsted acidity, as determined by the Hammett method. Addnl., on the basis of exptl. results and d. functional theory calculations, an electrophilic activation mechanism induced by hydrogen bonds is proposed. This strategy of adjustable acidity and anion structure in ILs provides an opportunity to develop other ILs for bio-based polyesters through green synthesis pathways.
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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics