Collection of Czechoslovak Chemical Communications · 1979 · 32 citations · 0 references
Natural SciencesBiochemistryChemistryCarbohydrate ChemistrySpectroscopyStructural BiochemistryAnomeric ConfigurationCarbohydrate ConformationConformational AnalysisConformational ChangeMolecular SymmetryTertiary StructureAnomeric EffectCarbohydrate NmrConfiguration Determination By Nuclear Magnetic Resonance SpectroscopyLanthanide SpectroscopyPyranose ConformationRing Conformation Effects On Anomeric ConfigurationSubstituent Effects On Ring ConformationTorsion
The 1 H NMR spectra of 1,6-anhydro-β-D-hexopyranoses and their triacetates, measured in hexadeuteriodimethyl sulfoxide or deuteriochloroform, confirmed the existence of these compounds in 1 C 4 (D) conformations, with the pyranose ring partly planarized in dependence on the configuration of the substituents in positions C (2) , C (3) and C (4) . The effects of the substituents on the chemical shifts and the adjusted relationship for the dependence of vicinal coupling constants on the torsion angle are discussed in detail from the point of view of the determination of the configuration and the conformation of 1,6-anhydro-β-D-hexopyranoses and their derivatives. The 1 H NMR spectra of triacetates were also measured in the presence of the lanthanide shift reagent, tris(1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octanedione) europium (III) [Eu.(FOD) 3 ].