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Chapter 28: Problem 28.43 (page 1148)

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

  1. β-D-talopyranose
  2. α-D-galactopyranose
  3. α-D-tagatofuranose

Short Answer

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Answer

a.

b.

c.

Step by step solution

01

Step-by-Step Solution Step 1: 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 is drawn down.

02

Haworth projection of  β-D-talopyranose

a. The β-D-talopyranoseis a D-sugar means CH2OHis 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 meansCH2OHis drawn upwards. It is anlocalid="1648627008192" αanomer, and this means OH is down at C1.


Haworth projection of α-D-galactopyranose

04

Haworth projection of α-D-tagatofuranose

c. The α-D-tagatofuranoseis a D-sugar means CH2OHis drawn upwards. It is αan anomer, and this means OH is down at C1.

Haworth projection ofα-D-tagatofuranose

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Most popular questions from this chapter

Draw theβ anomer of a monosaccharide epimeric with D-glucose at C2 using a Haworth projection.

Question:How many different aldoheptoses are there? How many are d-sugars? Draw all d-aldoheptoses having the Rconfiguration at C2 and C3.

Identify the compounds A-D. A D-aldopentose A is oxidized with to an optically inactive aldaric acid. B. A undergoes the Kiliani-Fischer synthesis to yield C and D. C is oxidized to an optically active aldaric acid. D is oxidized to an optically inactive aldaric acid.

Question: Assign R,S designations to each stereogenic center in glucose.

The following isomerization reaction, drawn using D-glucose as starting material, occurs with all aldohexoses in the presence of base. Draw a stepwise mechanism that illustrates how each compound is formed.
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