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Chapter 28: Question 28.47 (page 1148)

D-Arabinose can exist in both pyranose and furanose forms.

  1. Draw the αandβanomers of D-arabinofuranose.
  2. Draw the αandβ anomers of D-arabinopyranose.

Short Answer

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Answer

(a.)and

(b.)and

Step by step solution

01

Anomers

Anomers are the cyclic saccharides which are epimers at the C1 (anomeric carbon).At C1, theα anomer has the OH group in the downside, and in the case of βanomer, the OH group is in the upside.

02

The structure of D-Arabinose

The D-Arabinose structure is shown as,

D-Arabinose structure

03

α and β anomers of D-arabinofuranose

In D-arabinofuranose, at C1, the αanomer has an OH group in the down position.

In the βanomer, the OH group is in the up position.

anomers of D-arabinofuranose

04

α and β anomers of D-arabinopyranose.

In D-arabinopyranose, at C1, the αanomer has an OH group downward.

In theβanomer, the OH group is in the upward direction.

αandβ anomers of D-arabinopyranose

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Most popular questions from this chapter

Classify each compound as a reducing or nonreducing sugar.

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Drawthe structure of:

(a) a polysaccharide formed by joining d-mannose units in 1→4-β-glycosidic linkages;

(b) a polysaccharide formed by joining d-glucose units in 1→6-α-glycosidic linkages.

The polysaccharide in (b) is dextran, a component of dental plaque.

Which d-aldopentoses are reduced to optically inactive alditols using NaBH4,CH3OH?

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Draw a Haworth projection for each compound using the structures in Figures 28.4 and 28.5.
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