CH3 81Br H,C- 79Br HY H- t-Bu- II

Chemistry
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Chapter1: Chemical Foundations
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### Cyclohexene and Bromine Predominance

#### Question:
Ignoring isotope effects, after one E2 elimination with ethoxide, which bromine will predominate in the cyclohexene product? Explain your choice in 50 words or less.

#### Diagram Description:
The diagram illustrates a substituted cyclohexane with various substituents:

- **CH₃ (methyl group)** on the top carbon.
- **t-Bu (tertiary-butyl group)** on the bottom left carbon.
- Two **Br (bromine) atoms**:
  - One labeled as ⁸¹Br on the top right carbon.
  - One labeled as ⁷⁹Br on the right carbon.
- Several **H (hydrogen) atoms** on other carbons.

#### Explanation:
In an E2 reaction, the elimination occurs with the most accessible hydrogen anti to the leaving group. The ⁸¹Br leaves due to better accessible elimination, favoring more stable alkene with less steric hindrance from substituents.
Transcribed Image Text:### Cyclohexene and Bromine Predominance #### Question: Ignoring isotope effects, after one E2 elimination with ethoxide, which bromine will predominate in the cyclohexene product? Explain your choice in 50 words or less. #### Diagram Description: The diagram illustrates a substituted cyclohexane with various substituents: - **CH₃ (methyl group)** on the top carbon. - **t-Bu (tertiary-butyl group)** on the bottom left carbon. - Two **Br (bromine) atoms**: - One labeled as ⁸¹Br on the top right carbon. - One labeled as ⁷⁹Br on the right carbon. - Several **H (hydrogen) atoms** on other carbons. #### Explanation: In an E2 reaction, the elimination occurs with the most accessible hydrogen anti to the leaving group. The ⁸¹Br leaves due to better accessible elimination, favoring more stable alkene with less steric hindrance from substituents.
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