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13.18 Identify each of the following as D or L: Η. 0

13.18 Identify each of the following as D or L: Η. 0

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**13.18 Identify each of the following as D or L:** The image displays Fischer projections of three molecules labeled a, b, and c. Each structure contains multiple functional groups, including hydroxyl (OH) and aldehyde (CHO) groups, and they differ in terms of configuration around the chiral center(s). - **a.** - Structure: The topmost carbon is part of an aldehyde group, with a hydrogen atom on the right and a hydroxyl group on the left. The bottom carbon is a CH2OH group. - Configuration: The hydroxyl group on the left indicates this is an L-configuration. - **b.** - Structure: Similar to the first structure but with an additional chiral center. Both chiral centers have hydroxyl groups on the left side. - Configuration: The presence of hydroxyl groups on the left for both centers suggests an L-configuration. - **c.** - Structure: The topmost carbon is part of an aldehyde group, with a hydroxyl group on the right and a hydrogen atom on the left. The bottom carbon is a CH2OH group. - Configuration: The hydroxyl group on the right indicates this is a D-configuration. **Explanation:** In Fischer projections, the D or L configuration is determined by the orientation of the hydroxyl group on the chiral center furthest from the aldehyde or ketone group. If the hydroxyl group is on the right, it is designated as D; if on the left, it is designated as L.
Transcribed Image Text:**13.18 Identify each of the following as D or L:** The image displays Fischer projections of three molecules labeled a, b, and c. Each structure contains multiple functional groups, including hydroxyl (OH) and aldehyde (CHO) groups, and they differ in terms of configuration around the chiral center(s). - **a.** - Structure: The topmost carbon is part of an aldehyde group, with a hydrogen atom on the right and a hydroxyl group on the left. The bottom carbon is a CH2OH group. - Configuration: The hydroxyl group on the left indicates this is an L-configuration. - **b.** - Structure: Similar to the first structure but with an additional chiral center. Both chiral centers have hydroxyl groups on the left side. - Configuration: The presence of hydroxyl groups on the left for both centers suggests an L-configuration. - **c.** - Structure: The topmost carbon is part of an aldehyde group, with a hydroxyl group on the right and a hydrogen atom on the left. The bottom carbon is a CH2OH group. - Configuration: The hydroxyl group on the right indicates this is a D-configuration. **Explanation:** In Fischer projections, the D or L configuration is determined by the orientation of the hydroxyl group on the chiral center furthest from the aldehyde or ketone group. If the hydroxyl group is on the right, it is designated as D; if on the left, it is designated as L.
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