Table 1. Comparison of Different Heterogeneous Acidic Catalysts in the Synthesis of HMF^a.

		selectivity %b		b
#	acidic catalyst	HMF	OBMF	yield %
1	Amberlyst-15	98	2	64
2	Amberlyst-36	98	2	65
3	Purolite CT151	94	6	66
4	Purolite CT269	97	3	67
5	Purolite CT275	96	4	63
6	Purolite CT275DR	98	2	73

^aReaction conditions: 3.75 g of d-fructose was dissolved in 30 mL of DMC/TEAB (20% wt.) in the presence of a heterogeneous acidic catalyst (10% wt.), in an autoclave at 110 °C for 2 h.

^bEstimated via ¹H-NMR.