7. Draw the two chair conformations of the compound below. Which of the two conformations is the major one at equilibrium? Briefly explain. OH HO you HO OH OH D-Altrose
7. Draw the two chair conformations of the compound below. Which of the two conformations is the major one at equilibrium? Briefly explain. OH HO you HO OH OH D-Altrose
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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![**Question 7:** Draw the two chair conformations of the compound below. Which of the two conformations is the major one at equilibrium? Briefly explain.
![Diagram of D-Altrose]
D-Altrose is depicted in a cyclic form with hydroxyl groups attached to its carbon ring.
**Explanation for Educational Context:**
The compound, D-Altrose, is a hexose sugar depicted in its cyclic form, specifically as a pyranose (six-membered ring). In analyzing D-Altrose, we focus on its ability to adopt different chair conformations, which are three-dimensional arrangements that minimize steric hindrance and strain within the molecule.
### Chair Conformations:
1. **Conformation 1**
- In one chair conformation, certain hydroxyl groups (OH) and hydrogen atoms are positioned axially (parallel to the ring's axis), while others are equatorial (pointing outward from the ring).
2. **Conformation 2**
- In the alternative chair conformation, the positioning of the groups switches, with previously axial groups becoming equatorial and vice versa.
### Determining the Major Conformation:
- The stability of each conformation is influenced by the positions (axial vs equatorial) of the bulky hydroxyl groups. Generally, equatorial positioning is favored as it reduces steric hindrance and potential interactions between groups.
- Therefore, the major conformation is typically the one where more hydroxyl groups are in the equatorial position, minimizing steric strain and enhancing stability at equilibrium.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F335d6cef-e110-4df1-b3c9-cf74ce65a19c%2F2158330c-62ab-4195-bf63-1d0640e2c366%2Flq1iga_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Question 7:** Draw the two chair conformations of the compound below. Which of the two conformations is the major one at equilibrium? Briefly explain.
![Diagram of D-Altrose]
D-Altrose is depicted in a cyclic form with hydroxyl groups attached to its carbon ring.
**Explanation for Educational Context:**
The compound, D-Altrose, is a hexose sugar depicted in its cyclic form, specifically as a pyranose (six-membered ring). In analyzing D-Altrose, we focus on its ability to adopt different chair conformations, which are three-dimensional arrangements that minimize steric hindrance and strain within the molecule.
### Chair Conformations:
1. **Conformation 1**
- In one chair conformation, certain hydroxyl groups (OH) and hydrogen atoms are positioned axially (parallel to the ring's axis), while others are equatorial (pointing outward from the ring).
2. **Conformation 2**
- In the alternative chair conformation, the positioning of the groups switches, with previously axial groups becoming equatorial and vice versa.
### Determining the Major Conformation:
- The stability of each conformation is influenced by the positions (axial vs equatorial) of the bulky hydroxyl groups. Generally, equatorial positioning is favored as it reduces steric hindrance and potential interactions between groups.
- Therefore, the major conformation is typically the one where more hydroxyl groups are in the equatorial position, minimizing steric strain and enhancing stability at equilibrium.
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