Question

Pick at least two functional groups present in dextrose and describe where they would appear in the IR spectrum of this compound. Please be sure to include the actual absorption frequencies in your discussion posting.

Please label all protons in dextrose structure and indicate what would be the multiplicity of each set of non-equivalent protons in dextrose (singlet, doublet, etc.)?

Answer 1

HO он он он он он он Dextrose is a sugar usually obtained by the hydrolysis of Starch It contains one molecule of water of hydration or is anhydrous.D-G lucose.monohydrate It has alcohol, aldehyde functionality. In Ir spectrum shows 3400 cm-1 for O-H streching, streching 1270 cm-1 for C-O vibrations, 650 cm-1 for C-C vibrations HO 5.2 он On the 'H NMR spectrum, there is no signal in the 9- to 10-ppm regiorn On 'H NMR, there is a doublet at 5.2 6, which is consistent with the existence of a proton that is bonded to acarbon that is bonded to two oxygens (the anomeric carbon. C1) The coupling constant (J) for this doublet is 3.73 Hz, which is consistent with the smaller axial-equatorial dihedral angle at H-C1-C2-H, which is approximately 60', thus identifying this anomer as the a anomer. The most obvious of the other new signals is the doublet of doublets near 3.2 6 for the hydrogen on C2 in the p anomer он но 3.0 dd он 3.76 multiplet 3.40 3.49, multiplet 49 multiplet OH