Figure 3. Molecular graph for the aldo-pentose sugars. L-lyxose
deprotonated at C2-HO2 (h), D-ribose
deprotonated at C3-HO3 and
C4-HO4 (m,n), and L-arabinose
deprotonated at C3-HO3 site (e) exhibit
bifurcated intramolecular H-bonds. While other conjugate bases of
aldo-pentose show conventional intramolecular H-bonds. Small red spheres
and lines correspond to the BCPs and bond paths. |