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Why is alpha (a) the predominant anomeric form of mannose? A. The alpha-anomer is more unstable because of the presence of more axial substituents B. The beta-anomer is more unstable because of the delta-2 effect of steric repulsions between the lone pairs of the equatorial OH at C1 and the axial OH at C2

Why is alpha (a) the predominant anomeric form of mannose? A. The alpha-anomer is more unstable because of the presence of more axial substituents B. The beta-anomer is more unstable because of the delta-2 effect of steric repulsions between the lone pairs of the equatorial OH at C1 and the axial OH at C2

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
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Why is alpha (a) the predominant anomeric form of mannose? A. The alpha-anomer is more unstable because of the presence of more axial substituents B. The beta-anomer is more unstable because of the delta-2 effect of steric repulsions between the lone pairs of the equatorial OH at C1 and the axial OH at C2 C. The beta-anomer is more unstable because of the steric repulsions between the lone pairs of the equatorial OH at C1 and C2 D. Although the alpha-anomer has more axial OH, the instability factors created by one is cancelled by the other. E. The alpha-anomer creates a more open structure than the beta-anomer.
Transcribed Image Text:Why is alpha (a) the predominant anomeric form of mannose? A. The alpha-anomer is more unstable because of the presence of more axial substituents B. The beta-anomer is more unstable because of the delta-2 effect of steric repulsions between the lone pairs of the equatorial OH at C1 and the axial OH at C2 C. The beta-anomer is more unstable because of the steric repulsions between the lone pairs of the equatorial OH at C1 and C2 D. Although the alpha-anomer has more axial OH, the instability factors created by one is cancelled by the other. E. The alpha-anomer creates a more open structure than the beta-anomer.
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