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Catalytic system Cu(NO 3 ) 2 /NHPI can be successfully used for the mild oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran with molecular oxygen. The oxidation reaction takes place at 50°C and 1atm O 2 and selectively converts the primary hydroxymethyl group of HMF to the aldehyde one. The selective formation of aromatic aldehyde is observed because of the higher...