Abstract:The synthesis of 5,5'(oxy-bis(methylene))bis-2-furfural (OBMF) from 5-hydroxymethylfurfural (5-HMF) was studied using bulk and alumina-supported Preyssler heteropolyacids. The formation of OBMF was related to the amount of Brönsted acid sites, the lowest yield to OBMF being obtained with supported heteropolyacids. However, the Lewis acidity of HPA supported on Al2O3 favored the formation of 2,5-dimethylfurane. The effects of solvent, catalyst loading, temperature and reaction time on the selectivity to OBMF from 5-HMF were studied in order to optimize OBMF production using bulk Preyssler heteropolyacids; a yield of 84 % to OBMF was obtained at 5 h and 343 K. These results demonstrate that bulk Preyssler heteropolyacid is a good candidate for OBMF synthesis under mild reaction conditions.

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