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Reaction progress of the ZnCl2 catalyzed formation of BTO from HMF at different sand bath temperatures (each t data point represents a separate experiment). (a) Conversion of HMF and (b) BTO yield. (HPLC, DMSO as internal standard. Conditions: 5 mL 0.05 M aqueous HMF and 1.2 mM ZnCl2, P0 = 80–120 bar N2 depending on the final temperature.)
