The Haworth projection formula for the α − anomer of the given Fischer projection formula of a monosaccharide has to be drawn. Concept introduction: The Haworth projection formula can be drawn by using the following rules. • For α and β configurations, if hydroxyl group is drawn at the right position in Fischer projection formula then in the cyclic form of Haworth projection, the same OH group should be drawn below the ring. • If hydroxyl group is drawn at the left position in Fischer projection formula then in the cyclic form of Haworth projection, the same OH group should be drawn above the ring. • For β configuration, the position of OH group at the first carbon with respect to CH 2 OH group always remains in the same direction. • For α configuration, the position of OH group at the first carbon with respect to CH 2 OH group always remains in the opposite direction. • The hydroxyl group that is obtained from the carbonyl group can be placed above or below the ring which is dependent upon the ring closure of the cyclic form. • For D configuration, CH 2 OH group always placed above the cyclic ring. • For L configuration, CH 2 OH group always placed below the cyclic ring.

Question

Identify each of the following Haworth projection formulas as an a-D monosaccharide or a ß D-monosaccharide.

Answer 1

Question

Chapter 18, Problem 18.79EP

(a)

Interpretation Introduction

Interpretation: The Haworth projection formula for the α−anomer of the given Fischer projection formula of a monosaccharide has to be drawn.

Concept introduction: The Haworth projection formula can be drawn by using the following rules.

• For α and β configurations, if hydroxyl group is drawn at the right position in Fischer projection formula then in the cyclic form of Haworth projection, the same OH group should be drawn below the ring.

• If hydroxyl group is drawn at the left position in Fischer projection formula then in the cyclic form of Haworth projection, the same OH group should be drawn above the ring.

• For β configuration, the position of OH group at the first carbon with respect to CH2OH group always remains in the same direction.

• For α configuration, the position of OH group at the first carbon with respect to CH2OH group always remains in the opposite direction.

• The hydroxyl group that is obtained from the carbonyl group can be placed above or below the ring which is dependent upon the ring closure of the cyclic form.

• For D configuration, CH2OH group always placed above the cyclic ring.

• For L configuration, CH2OH group always placed below the cyclic ring.

(b)

Interpretation Introduction

Interpretation: The Haworth projection formula for the α−anomer of the given Fischer projection formula of a monosaccharide has to be drawn.

Concept introduction: The Haworth projection formula can be drawn by using the following rules.

• For α and β configurations, if hydroxyl group is drawn at the right position in Fischer projection formula then in the cyclic form of Haworth projection, the same OH group should be drawn below the ring.

• If hydroxyl group is drawn at the left position in Fischer projection formula then in the cyclic form of Haworth projection, the same OH group should be drawn above the ring.

• For β configuration, the position of OH group at the first carbon with respect to CH2OH group always remains in the same direction.

• For α configuration, the position of OH group at the first carbon with respect to CH2OH group always remains in the opposite direction.

• The hydroxyl group that is obtained from the carbonyl group can be placed above or below the ring which is dependent upon the ring closure of the cyclic form.

• For D configuration, CH2OH group always placed above the cyclic ring.

• For L configuration, CH2OH group always placed below the cyclic ring.

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