Figure 2 : 13C NMR spectra of reactants and products for epimerization and isomerization reactions.

From: Sn-Beta zeolites with borate salts catalyse the epimerization of carbohydrates via an intramolecular carbon shift

Figure 2

(a) D-(1-13C)glucose with SB in a 4:1 glucose:SB ratio; (b) product mixture after reacting D-(1-13C)glucose with SB in a 4:1 glucose:SB ratio and Sn-Beta; (c) D-(1-13C)glucose; and (d) product mixture after reacting D-(1-13C)glucose with Sn-Beta.