Pyranoses and Furanoses: Ring-Chain Tautomerism In Sugars
2017年7月13日 · The pyranose form of glucose is just one of the cyclic forms that glucose can adopt. It’s also possible for the hydroxyl group on C-4 of glucose to attack the aldehyde. This forms a five-membered ring. We call this form the furanose form, in reference to the cyclic 5-membered ether furan. (Helpful mnemonic: Five = Furanose)
Effective selectivity conversion of glucose to furan chemicals in …
2021年2月1日 · This study suggested a sustainable synthetic pathway from abundant biomass glucose to furan products and value-added chemicals in the presence of completely green material and catalysts, which showed advantages for the industrial application.
Tailoring the Formation of Functionalized Furans from Glucose in …
2024年3月19日 · Here, we employed various nontoxic catalysts sourced from nature to achieve the C-C extension of unprotected glucose with malononitrile (Figure 1 a) into substituted dihydrofuran or furan derivatives with high regio- and stereoselectivity. The catalysts included inorganic MgO and the reaction mechanism and active species in the reaction were ...
A catalytic approach via retro-aldol condensation of glucose …
2021年4月24日 · We report here a catalytic conversion of glucose with acetylacetone (acac) to furan-centered chemicals, 2-methyl-3-acetylfuran (MAF) and 1- (5- (1,2-dihydroxyethyl)-2-methylfuran-3-yl)ethan-1-one (DMAF), which are potential building blocks for the synthesis of …
Pyranose v/s Furanose form of Glucose and Fructose
2021年1月9日 · That fructose in sucrose is a furanoside is irrelevant. You are correct that the same reasoning can be applied to fructose, and, as with glucose, the beta-pyranose form is most stable. It is common in biochemistry textbooks, however, to draw fructose as a furanose.
A catalytic approach via retro-aldol condensation of glucose to furanic ...
The synthesis of new types of furan-based compounds other than 5-hydroxymethylfurfural from glucose is a very attractive yet underexploited strategy. We report here a catalytic conversion of glucose with acetylacetone (acac) to furan-centered chemicals, 2-methyl-3-acetylfuran (MAF) and 1-(5-(1,2-dihydroxyeth
Effect of pH, temperature and heating time on the formation of furan …
2013年6月1日 · For glucose–glycine system, furan formed significantly lower (P < 0.05) in acidic conditions in comparison with neutral and alkaline conditions when temperatures were greater than 140 °C. In the fructose–glycine system, the lowest level of furan was detected in acid condition whereas the sucrose–glycine system had the lowest furan ...
三种常见糖类产生呋喃的影响因素研究 - spgykj.com
The results showed that pH, temperature and heating time affected profoundly furan formation from model systems of glucose, fructose and sucrose due to thermal processing. For glucose and fructose, less furan was formed at acid pH, but for sucrose, …
Conversion of selected carbohydrates into furan aldehydes in …
2021年11月1日 · This paper reports a study on the catalytic conversion of selected carbohydrates (glucose, xylose, fructose) to furan aldehydes: furfural and 5-hydroxymethylfurfural in water as solvent. The catalytic system consists of relatively weaker acidic hydrogen sulfate imidazolium ILs and strong protic Brønsted acid (H 2 SO 4 ).
Mechanistic insights into furan formation in Maillard model systems
2011年1月12日 · Under both roasting and pressure-cooking conditions, furan was formed from glucose via the intact skeleton, and its formation pathways from glucose alone were not amino acid-dependent. However, some amino acids, especially alanine and serine, did influence the furan production by providing an additional formation pathway.
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