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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

A D-aldohexose A is formed from an aldopentose B by the Kiliani-Fischer synthesis. Reduction of A with forms an optically inactive alditol. Oxidation of B forms an optically active aldaric acid. What are the structures of A and B?

What two aldohexoses yield d-arabinose upon Wohl degradation?

Classify each compound as a reducing or nonreducing sugar.

(a.)

(b.)

(c.)

Which D-aldopentose is oxidized to an optically active aldaric acid and undergoes the Wolf degradation to yield a D-aldotetrose that is oxidized to an optically active aldaric acid?

Drawthe products of each reaction.

(a.)

(b.)
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