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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

In the formation of a pyranose ring, the carbon atom that becomes the new chiral center (anomeric carbon) and can exist in two configurations (α and β) is the one that was originally the

A. Carbonyl carbon in the open-chain form
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B. Penultimate carbon (C-5) in the chain
C. Carbon bearing the primary alcohol group
D. Carbon that determines the D/L configuration

📝 Explanation

The anomeric carbon is derived from the carbonyl carbon of the open-chain form. In glucose, this is C-1. The nucleophilic attack by the C-5 hydroxyl group on this planar carbonyl carbon can occur from either face, creating the two possible anomeric configurations: α (-OH down) or β (-OH up).

📖 Additional Information

  • Carbonyl carbon in the open-chain form
  • Penultimate carbon (C-5) in the chain
  • Carbon bearing the primary alcohol group
  • Carbon that determines the D/L configuration

The anomeric carbon is derived from the carbonyl carbon of the open-chain form. In glucose, this is C-1. The nucleophilic attack by the C-5 hydroxyl group on this planar carbonyl carbon can occur from either face, creating the two possible anomeric configurations: α (-OH down) or β (-OH up).

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