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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

Concerning the behavior of glucose in solution, the two anomeric forms (α and β) are not equally stable. β-D-glucose is the more stable and predominant anomer (64%) at equilibrium because, in its chair conformation, all the bulky substituents (-OH and -CH₂OH) are in the

A. Axial positions
B. Equatorial positions
✓
C. Cis configuration
D. Trans configuration

📝 Explanation

In β-D-glucose, the anomeric -OH on C1 is equatorial. In the chair form, bulky substituents in equatorial positions have more space and experience less steric strain (1,3-diaxial interactions), making this conformation thermodynamically more stable than the α-anomer (axial -OH).

📖 Additional Information

  • Axial positions
  • Equatorial positions
  • Cis configuration
  • Trans configuration

In β-D-glucose, the anomeric -OH on C1 is equatorial. In the chair form, bulky substituents in equatorial positions have more space and experience less steric strain (1,3-diaxial interactions), making this conformation thermodynamically more stable than the α-anomer (axial -OH).

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