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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 尾-D-talopyranose is a D-sugar means CH2OH is drawn upwards. It is a 尾anomer, and this means OH is up at C1.

Haworth projection of尾-D-talopyranose

03

Haworth projection of α-D-galactopyranose

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


Haworth projection of伪-D-galactopyranose

04

Haworth projection of α-D-tagatofuranose

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


Haworth projection of伪-D-tagatofuranose

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Most popular questions from this chapter

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?

Classify each compound as a reducing or nonreducing sugar.

(a.)

(b.)

(c.)

Classify each compound as identical to A or its enantiomer.

(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?

(a) Why can鈥檛 two purine bases (A and G) form a base pair and hydrogen bond to each other on two strands of DNA in the double helix? (b) Why is hydrogen bonding between guanine and cytosine more favorable than hydrogen bonding between guanine and thymine?
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