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Chemistry
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Chapter1: Chemical Foundations
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Draw the two structures for the markovnikov and anti-markovnikov products possible from this reaction. How do you know if the product made is markovnikov or anti-markovnikov?
### Hydroboration-Oxidation Reaction of an Alkene

**Reaction Overview:**
This image illustrates the hydroboration-oxidation of an alkene to form an alcohol.

**Mechanism Steps:**

1. **Hydroboration:**
   - **Reagents:** BH₃ (borane) in THF (tetrahydrofuran)
   - The alkene (CH₂=CHCH₃) reacts with BH₃.
   - A transition state complex is formed where boron (B) adds to the less substituted carbon, and hydrogen (H) adds to the more substituted carbon of the double bond, following anti-Markovnikov's rule.
   - This results in an organoborane intermediate.

2. **Oxidation:**
   - **Reagents:** NaOH (sodium hydroxide) and H₂O₂ (hydrogen peroxide)
   - The organoborane intermediate is treated with NaOH and H₂O₂.
   - The boron group is replaced by an hydroxyl group (OH), producing the alcohol.
   
**Final Product:**
The alcohol obtained has the OH group attached to the less substituted carbon of the original double bond.

This reaction is a key method for converting alkenes into alcohols with anti-Markovnikov selectivity, meaning the addition of the OH group occurs at the end of the molecular chain, opposite from the more substituted carbon.
Transcribed Image Text:### Hydroboration-Oxidation Reaction of an Alkene **Reaction Overview:** This image illustrates the hydroboration-oxidation of an alkene to form an alcohol. **Mechanism Steps:** 1. **Hydroboration:** - **Reagents:** BH₃ (borane) in THF (tetrahydrofuran) - The alkene (CH₂=CHCH₃) reacts with BH₃. - A transition state complex is formed where boron (B) adds to the less substituted carbon, and hydrogen (H) adds to the more substituted carbon of the double bond, following anti-Markovnikov's rule. - This results in an organoborane intermediate. 2. **Oxidation:** - **Reagents:** NaOH (sodium hydroxide) and H₂O₂ (hydrogen peroxide) - The organoborane intermediate is treated with NaOH and H₂O₂. - The boron group is replaced by an hydroxyl group (OH), producing the alcohol. **Final Product:** The alcohol obtained has the OH group attached to the less substituted carbon of the original double bond. This reaction is a key method for converting alkenes into alcohols with anti-Markovnikov selectivity, meaning the addition of the OH group occurs at the end of the molecular chain, opposite from the more substituted carbon.
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