PRIN.OF GENERAL,ORGANIC+BIOLOG.CHEM.
PRIN.OF GENERAL,ORGANIC+BIOLOG.CHEM.
2nd Edition
ISBN: 9781266811852
Author: SMITH
Publisher: MCG
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Chapter 14, Problem 14.43AP

a.

Interpretation Introduction

Interpretation:

The monosaccharide given has to be labelled as α or β isomer.

Concept Introduction:

Monosaccharide can be expressed in a cyclic form.  In case of an aldohexose, the hydroxyl group present on the C5 carbon atom reacts with the carbonyl group present in C1 carbon atom resulting in formation of a six-membered ring.  Procedure to be followed for obtaining cyclic structure are given as follows.

  • Carbon skeleton has to be rotated to 90°.  While rotating, the groups that are present on the right side ends up below after rotation.
  • Chain has to be twisted in order to put the hydroxyl group closer to the carbonyl group of aldehyde.  The CH2OH group present on C5 is drawn up.
  • The OH group on the C5 carbon atom reacts with the aldehyde carbonyl resulting in formation of six-membered ring that has a new chiral center.  Considering the orientation of OH group that is present on the new chiral center that is formed, two isomers are possible.

If the OH group in the new chiral center is drawn up means, then it is known as β isomer.  If the OH group in the new chiral center is drawn down means, then it is known as α isomer.

This cyclic form of representation of the monosacccharides as flat, six-membered rings is known as Haworth projections.

b.

Interpretation Introduction

Interpretation:

Other cyclic form of the monosaccharide given has to be drawn.

Concept Introduction:

Refer part “a.”.

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