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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Transcribed Image Text:**Question 8: What is the enol intermediate at the end of the reactions?**
The image presents a multiple-choice question with five options (a to e) related to organic chemistry. The task is to identify the enol intermediate formed at the end of a specified series of chemical reactions.
**Reaction Details:**
The initial compound is a diketone with the following structure:
- A six-carbon chain with two ketone groups (C=O) on the first and fifth carbons.
- An ethyl group is attached to the third carbon.
**Reactions:**
1. **NaOCH₃ (Sodium methoxide)**: A base that might assist in deprotonation at the alpha carbon positions to form enolates.
2. **CH₃I (Methyl iodide)**: Used for methylation reactions.
3. **NaOH/H⁺/Heat**: Indicative of conditions that facilitate enolization or further reaction steps involving heat.
**Multiple-Choice Options:**
- **Option a**: Displays a five-membered ring with a hydroxyl group and a ketone group adjacent to each other.
- **Option b**: Shows a five-membered ring with a hydroxyl group attached, without adjacent carbonyl groups.
- **Option c**: Contains a five-membered ring with a hydroxyl group but lacks additional substituents.
- **Option d**: Features a complex structure with two hydroxyl groups, each adjacent to a ketone group, forming a more elaborate system.
- **Option e**: Indicates that none of the previous structures (a–d) represents the correct enol intermediate.
To solve the problem, the student must understand the mechanism of keto-enol tautomerization, how the reagents influence the reaction, and the stability of the possible intermediates.
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