Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Provide The major organic products for each reaction 

### Reaction 1

**Starting Material:**  
\( \text{CH}_3\text{C}\equiv\text{CH} \) (Propyne)

**Reagent:**  
\( \text{2Cl}_2 \)

**Description:**  
In this reaction, propyne (\( \text{CH}_3\text{C}\equiv\text{CH} \)) undergoes halogenation when treated with excess chlorine (\( \text{2Cl}_2 \)). This process typically results in the addition of four chlorine atoms, transforming the triple bond into a single bond.

---

### Reaction 2

**Starting Material:**  
\( \text{CH}_3\text{C}\equiv\text{CH} \) (Propyne)

**Reagent:**  
\( \text{2HCl} \)

**Description:**  
Here, propyne reacts with hydrogen chloride (\( \text{2HCl} \)) in an addition reaction. This leads to the conversion of the alkyne into a geminal dihalide, where both chlorine atoms add to the same carbon.

---

### Reaction 3

**Starting Material:**  
A cyclopentyl group attached to an alkyne.

**Reagents:**  
1. \( \text{BH}_3, \text{THF} \)
2. \( \text{HO}^-, \text{H}_2\text{O}_2, \text{H}_2\text{O} \)

**Description:**  
This reaction depicts a hydroboration-oxidation process. Initially, the alkyne undergoes hydroboration using borane (\( \text{BH}_3 \)) with tetrahydrofuran (THF) as a solvent. Following this, oxidation is carried out with hydrogen peroxide (\( \text{H}_2\text{O}_2 \)) in a basic medium (\( \text{HO}^- \)), transforming the alkyne into a corresponding enol, which tautomerizes to give the final product, an aldehyde or ketone depending on the substitution pattern.
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Transcribed Image Text:### Reaction 1 **Starting Material:** \( \text{CH}_3\text{C}\equiv\text{CH} \) (Propyne) **Reagent:** \( \text{2Cl}_2 \) **Description:** In this reaction, propyne (\( \text{CH}_3\text{C}\equiv\text{CH} \)) undergoes halogenation when treated with excess chlorine (\( \text{2Cl}_2 \)). This process typically results in the addition of four chlorine atoms, transforming the triple bond into a single bond. --- ### Reaction 2 **Starting Material:** \( \text{CH}_3\text{C}\equiv\text{CH} \) (Propyne) **Reagent:** \( \text{2HCl} \) **Description:** Here, propyne reacts with hydrogen chloride (\( \text{2HCl} \)) in an addition reaction. This leads to the conversion of the alkyne into a geminal dihalide, where both chlorine atoms add to the same carbon. --- ### Reaction 3 **Starting Material:** A cyclopentyl group attached to an alkyne. **Reagents:** 1. \( \text{BH}_3, \text{THF} \) 2. \( \text{HO}^-, \text{H}_2\text{O}_2, \text{H}_2\text{O} \) **Description:** This reaction depicts a hydroboration-oxidation process. Initially, the alkyne undergoes hydroboration using borane (\( \text{BH}_3 \)) with tetrahydrofuran (THF) as a solvent. Following this, oxidation is carried out with hydrogen peroxide (\( \text{H}_2\text{O}_2 \)) in a basic medium (\( \text{HO}^- \)), transforming the alkyne into a corresponding enol, which tautomerizes to give the final product, an aldehyde or ketone depending on the substitution pattern.
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