Table 3. The energy E (a.u.) of CH3-pentose sugars and intramolecular H-bond lengths (A…H-D) in Å for their conjugate bases obtained at the B3LYP/6-311++G (d,p). Table 3. The energy E (a.u.) of CH3-pentose sugars and intramolecular H-bond lengths (A…H-D) in Å for their conjugate bases obtained at the B3LYP/6-311++G (d,p). Table 3. The energy E (a.u.) of CH3-pentose sugars and intramolecular H-bond lengths (A…H-D) in Å for their conjugate bases obtained at the B3LYP/6-311++G (d,p). Table 3. The energy E (a.u.) of CH3-pentose sugars and intramolecular H-bond lengths (A…H-D) in Å for their conjugate bases obtained at the B3LYP/6-311++G (d,p). Table 3. The energy E (a.u.) of CH3-pentose sugars and intramolecular H-bond lengths (A…H-D) in Å for their conjugate bases obtained at the B3LYP/6-311++G (d,p). Table 3. The energy E (a.u.) of CH3-pentose sugars and intramolecular H-bond lengths (A…H-D) in Å for their conjugate bases obtained at the B3LYP/6-311++G (d,p). Table 3. The energy E (a.u.) of CH3-pentose sugars and intramolecular H-bond lengths (A…H-D) in Å for their conjugate bases obtained at the B3LYP/6-311++G (d,p). Table 3. The energy E (a.u.) of CH3-pentose sugars and intramolecular H-bond lengths (A…H-D) in Å for their conjugate bases obtained at the B3LYP/6-311++G (d,p).
CH3-pentose
E (a.u.) in neutral
H-bonds in conjugate bases
deprotonation sites
deprotonation sites
deprotonation sites
deprotonation sites
C1-HO1 C2-HO2 C3-HO3 C4-HO4
L-Fucose -611.9612 O1….HO2-O2 1.97
O2….HO1-O1 1.91
O3….HO4-O4 1.93
O4….HO3-O3 1.78
O3….H2-C6 2.74
L-rhamnose -611.9588 O5….HO2-O2 2.08
O2….HO3-O3 O3….H3-C6 1.87 2.54
O3….HO2-O2 1.94
O4….HO3-O3 1.96