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Chapter 28: Question 28.16 (page 1123)

Aldotetroses exist in the furanose form. Draw both anomers of d-erythrose.

Short Answer

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Answer

Furanose anomers of D-Erythrose

Step by step solution

01

D-erythrose

The compound D-erythrose has the molecular formula C4H8O4. It acts as a plant metabolite and is also present in animal cells.The structure of D-erythrose is as shown:

D-erythrose

02

Furanose Ring

The ring with four carbons and one oxygen atom is a furanose ring; thus, furanose is a five-membered ring, and D-erythrose usually exists in furanose form.

03

Anomers of D-erythrose

The compound D-erythrose exists in two anomeric forms, which differ in the configuration at the first carbon.

Furanose anomers of D-Erythrose

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Most popular questions from this chapter

Draw the products formed when 伪-D-glucoseis treated with each reagent.

a.CH3I,Ag2O

b.CH3OH,HCl

c. Ac2O, pyridine

d. The product in (a), thenH3O+

e. The product in (b), then Ac2O, pyridine

f. The product in (d), then C6H5CH2Cl,Ag2O

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

Draw a stepwise mechanism for the following reaction.

For D-arabinose:

  1. Draw its enantiomer.
  2. Draw an epimer at C3.
  3. Draw a diastereomer that is not an epimer.
  4. Draw a constitutional isomer that still contains a carbonyl group.

(a)Label all the O atoms that are part of a glycoside in rebaudioside A. Rebaudioside A, marketed under the trade name Truvia, is a sweet glycoside obtained from the stevia plant, which has been used for centuries in Paraguay to sweeten foods. (b)The alcohol or phenol formed from the hydrolysis of glycoside is called an aglycon. What aglycon and monosaccharides are formed by the hydrolysis of rebaudioside A?
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