LYICHTIGST HO H Н 13.22 Identify each of the following as the D or L enantiomer: a. Н 0 b. с. Н HO НО = Arabinose Н- C Н ОН ОН CH₂OH C 0 Н -Н Lyxose ОН CH₂OH HO ДЛОВС HO НО H- d. Н CH₂OH 1 C=0 Н ОН НО НО НО- -Н CH OH Sorbose С =o Н Н Н CH OH Ribose 13.24 Draw the Fischer projection for the other enantiomer of a tod in problem 13.22. leg-

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**Title: Identifying D and L Enantiomers of Sugars**

**Objective:**
Learn how to identify the D and L enantiomers of sugars using Fischer projections.

**Exercises:**

**13.22 Identify each of the following as the D or L enantiomer:**

**a. Arabinose**

- Structure: 
  - Vertical chain with an aldehyde group (CHO) at the top.
  - Hydroxyl groups (OH) and hydrogen atoms (H) alternate along the carbon chain.
  - Ends with a CH\(_2\)OH group.
  - OH configuration from top to bottom: left, right, right.

**b. Sorbose**

- Structure:
  - Vertical chain with a ketone group (C=O) close to the top.
  - Hydroxyl groups (OH) and hydrogen atoms (H) alternate along the chain.
  - Ends with a CH\(_2\)OH group on both ends.
  - OH configuration from top to bottom: right, left, left.

**c. Lyxose**

- Structure:
  - Vertical chain with an aldehyde group (CHO) at the top.
  - Hydroxyl groups (OH) and hydrogen atoms (H) alternate along the carbon chain.
  - Ends with a CH\(_2\)OH group.
  - OH configuration from top to bottom: left, left, right.

**d. Ribose**

- Structure:
  - Vertical chain with an aldehyde group (CHO) at the top.
  - Hydroxyl groups (OH) and hydrogen atoms (H) alternate along the carbon chain.
  - Ends with a CH\(_2\)OH group.
  - OH configuration from top to bottom: left, left, left.

**Note:**
The configuration of the hydroxyl group on the penultimate carbon determines if the sugar is a D or L isomer. For D-sugars, the hydroxyl group is on the right in the Fischer projection, and for L-sugars, it is on the left.

**13.24 Draw the Fischer projection for the other enantiomer of a to d in problem 13.22.**

For this exercise, practice drawing the opposite enantiomer of each sugar listed above by reversing the positions of all hydroxyl groups (OH) and hydrogen atoms (H) in the Fischer projection.
Transcribed Image Text:**Title: Identifying D and L Enantiomers of Sugars** **Objective:** Learn how to identify the D and L enantiomers of sugars using Fischer projections. **Exercises:** **13.22 Identify each of the following as the D or L enantiomer:** **a. Arabinose** - Structure: - Vertical chain with an aldehyde group (CHO) at the top. - Hydroxyl groups (OH) and hydrogen atoms (H) alternate along the carbon chain. - Ends with a CH\(_2\)OH group. - OH configuration from top to bottom: left, right, right. **b. Sorbose** - Structure: - Vertical chain with a ketone group (C=O) close to the top. - Hydroxyl groups (OH) and hydrogen atoms (H) alternate along the chain. - Ends with a CH\(_2\)OH group on both ends. - OH configuration from top to bottom: right, left, left. **c. Lyxose** - Structure: - Vertical chain with an aldehyde group (CHO) at the top. - Hydroxyl groups (OH) and hydrogen atoms (H) alternate along the carbon chain. - Ends with a CH\(_2\)OH group. - OH configuration from top to bottom: left, left, right. **d. Ribose** - Structure: - Vertical chain with an aldehyde group (CHO) at the top. - Hydroxyl groups (OH) and hydrogen atoms (H) alternate along the carbon chain. - Ends with a CH\(_2\)OH group. - OH configuration from top to bottom: left, left, left. **Note:** The configuration of the hydroxyl group on the penultimate carbon determines if the sugar is a D or L isomer. For D-sugars, the hydroxyl group is on the right in the Fischer projection, and for L-sugars, it is on the left. **13.24 Draw the Fischer projection for the other enantiomer of a to d in problem 13.22.** For this exercise, practice drawing the opposite enantiomer of each sugar listed above by reversing the positions of all hydroxyl groups (OH) and hydrogen atoms (H) in the Fischer projection.
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