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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. 尾-D-talopyranose
  2. 伪-D-galactopyranose
  3. 伪-D-tagatofuranose

Short Answer

Expert verified

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


Haworth projection of 伪-D-galactopyranose

04

Haworth projection of α-D-tagatofuranose

c. The 伪-D-tagatofuranoseis a D-sugar means CH2OHis drawn upwards. It is 伪an 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

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

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

Question: Label each stereogenic center as RorS.

Question: Draw each stereogenic center using a Fischer projection formula.

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.
See all solutions

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