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Chapter 28: Q43P (page 1148)

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

Short Answer

Expert verified

Answer:

a.

b.

c.

Step by step solution

01

Haworth Projection

Haworth projection is the cyclic structure used for presenting the monosaccharides in 3-D. For D-sugar, CH2OH is drawn up, and in the case of L-sugar, the CH2OH is drawn down.

02

Haworth projection of  β-D-talapyranose

a. The β-D-talopyranose is a D-sugar means CH2OH is drawn upwards. It is a βanomer, and this means OH is up at C1.

Haworth projection ofβ-D-talopyranose

03

Haworth projection of α-D-galactopyranose

b. The α-D-galactopyranoseis a D-sugar means CH2OH is drawn upwards. It is an αanomer, and this means OH is down at C1.


Haworth projection ofα-D-galactopyranose

04

Haworth projection of α-D-tagatofuranose

The α-D-tagatofuranoseis a D-sugar means CH2OH is drawn upwards. It is an αanomer, and this means OH is down at C1.


Haworth projection ofα-D-tagatofuranose

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Most popular questions from this chapter

Draw a stepwise mechanism for the following reaction.

Drawthe products of each reaction.

(a.)

(b.)

Deduce the structure of the disaccharide maltose from the following data.

[1]Hydrolysis yields D-glucose exclusively.

[2] Isomaltose is cleaved with -αglycosidase enzymes.

[3] Isomaltose is a reducing sugar.

[4]Methylation with excess CH3I,Ag2Oand then hydrolysis withH3O+ forms two products:

(Both anomers are present.)

What products are formed when each compound is treated with aqueous acid?

(a.)

(b.)

(c.)

A 2-ketohexose is reduced with NaBH4 in CH3OH to form a mixture of D-galactitol and D-talitol. What is the structure of the 2-ketohexose?
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