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Structural Expression of Exo-Anomeric Effect.

Elena R Alonso1, Isabel Peña1, Carlos Cabezas1

  • 1Grupo de Espectroscopía Molecular (GEM), Edificio Quifima, Laboratorios de Espectroscopia y Bioespectroscopia, Unidad Asociada CSIC, Parque Científico UVa, Universidad de Valladolid , 47011 Valladolid, Spain.

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Summary
This summary is machine-generated.

The exo-anomeric effect in methyl-β-D-xyloside was studied using microwave spectroscopy. This effect influences molecular shape and is key to understanding biologically significant oligosaccharides.

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Area of Science:

  • Carbohydrate Chemistry
  • Structural Chemistry
  • Physical Chemistry

Background:

  • The exo-anomeric effect is a significant stereoelectronic phenomenon in carbohydrates.
  • Understanding its structural implications is crucial for carbohydrate science.

Purpose of the Study:

  • To experimentally determine the structural signatures of the exo-anomeric effect in methyl-β-D-xyloside.
  • To investigate the conformational preferences and their relation to the exo-anomeric effect.

Main Methods:

  • Broadband Fourier transform microwave spectroscopy.
  • Laser ablation for sample introduction.
  • Analysis of rotational constants and determination of rs structure using natural abundance isotopologues.

Main Results:

  • Identified a specific conformer (cc-β-(4)C1 g-) corresponding to the global minimum.
  • Observed a decrease in the glycosidic C1-O1 bond length (1.38 Å), consistent with the exo-anomeric effect.
  • Confirmed the role of aglycon orientation in maximizing the exo-anomeric effect.

Conclusions:

  • The exo-anomeric effect is a primary factor governing the three-dimensional structure of oligosaccharides.
  • Experimental structural data provides direct evidence for the exo-anomeric effect's influence.