Figure 3
A portion of the 1H NMR spectrum of D-fructose-cycloleucine in D2O at 293 K containing four sets of signals for methylene protons H1C and H1D. The labeled set of two doublets belongs to the dominant β-D-fructopyranose anomer of (I). The smaller, unlabeled peaks are unresolved signals of H1C and H1D belonging to the α-pyranose, α- and β-furanose conformations of (I). |