Abstract
In this paper, we report a new catalytic system for realizing the rapid and efficient oxidation of 5-hydroxymethylfurfural (HMF). First, we used 9-azabicyclo [3.3.1]nonan-3-one-N-oxyl (keto-ABNO) as a catalyst for the aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF) in acetic acid. Then, we systematically studied the important reaction parameters, including the solvent, co-catalyst, and temperature. The results demonstrate that the acidic solvent used is crucial for the efficient oxidation of HMF to DFF. Under optimal conditions, we achieved a 93.4% yield of DFF within half an hour at room temperature. We also proposed the possible mechanism for this system.
Highlights
With the current shortage of fossil fuels and rapid economic development, it is imperative to develop renewable resources
Scheme 1 illustrates the conversion of biomass into valuable chemicals, which involves the hydrolysis of polysaccharides to monosaccharides, and the dehydration of monosaccharides to furan compounds, such as 5-hydroxymethylfurfural (HMF)
The synthesis of DFF from biomass has attracted a lot of attention in recent years
Summary
With the current shortage of fossil fuels and rapid economic development, it is imperative to develop renewable resources. Cheap, green, and renewable characteristics is attracting particular attention. Researchers have focused on the cost-effective conversion of biomass into high-value chemicals, biofuels, and biomaterials [1]. Scheme 1 illustrates the conversion of biomass into valuable chemicals, which involves the hydrolysis of polysaccharides to monosaccharides, and the dehydration of monosaccharides to furan compounds, such as 5-hydroxymethylfurfural (HMF). 2,5-diformylfuran (DFF), 5-hydroxymethylfuran-2-carboxylic acid (HMFCA), 5-formyl-2-carboxylic acid (FFCA), 2,5-furandicarboxylicacid (FDCA), 2,5-dimethylcarboxylate (FDMC), and 2,5-dimethylfuran (DMF) can be obtained from HMF [2,3,4,5,6,7,8]. DFF is one of the most valuable furan derivatives The synthesis of DFF from biomass has attracted a lot of attention in recent years
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