Outline a detailed mechanism for the reaction below. Identify the abbreviation for the reaction mechanism. OH H;PO4

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**Topic: Reaction Mechanism and Abbreviation**

**Question 4:**

Outline a detailed mechanism for the reaction below. Identify the abbreviation for the reaction mechanism.

**Chemical Reaction:**

- The reactant is a cyclohexanol derivative with a hydroxyl group (OH) attached to a cyclohexane ring. There is also a methyl group attached to the ring.
- The reagent used is phosphoric acid (H₃PO₄).
- The product is a cyclohexene derivative with a double bond, indicating the elimination of water (dehydration) and the formation of an alkene from the alcohol group.

**Summary of Mechanism:**

1. **Protonation:** The hydroxyl group (OH) on the cyclohexanol derivative is protonated by the phosphoric acid (H₃PO₄), creating water, a good leaving group.
2. **Carbocation Formation:** Water leaves, forming a carbocation intermediate on the cyclohexane ring.
3. **Deprotonation:** A hydrogen is removed from the adjacent carbon, which results in the formation of a double bond, yielding the cyclohexene product.

**Abbreviation for Reaction Mechanism:**

- The reaction mechanism is an **E1 mechanism** (unimolecular elimination), characterized by the formation of a carbocation intermediate and subsequent elimination to form the double bond.

This detailed mechanism highlights the essential role of acid in facilitating the conversion of alcohols to alkenes through the formation of carbocation intermediates in E1 reactions.
Transcribed Image Text:**Topic: Reaction Mechanism and Abbreviation** **Question 4:** Outline a detailed mechanism for the reaction below. Identify the abbreviation for the reaction mechanism. **Chemical Reaction:** - The reactant is a cyclohexanol derivative with a hydroxyl group (OH) attached to a cyclohexane ring. There is also a methyl group attached to the ring. - The reagent used is phosphoric acid (H₃PO₄). - The product is a cyclohexene derivative with a double bond, indicating the elimination of water (dehydration) and the formation of an alkene from the alcohol group. **Summary of Mechanism:** 1. **Protonation:** The hydroxyl group (OH) on the cyclohexanol derivative is protonated by the phosphoric acid (H₃PO₄), creating water, a good leaving group. 2. **Carbocation Formation:** Water leaves, forming a carbocation intermediate on the cyclohexane ring. 3. **Deprotonation:** A hydrogen is removed from the adjacent carbon, which results in the formation of a double bond, yielding the cyclohexene product. **Abbreviation for Reaction Mechanism:** - The reaction mechanism is an **E1 mechanism** (unimolecular elimination), characterized by the formation of a carbocation intermediate and subsequent elimination to form the double bond. This detailed mechanism highlights the essential role of acid in facilitating the conversion of alcohols to alkenes through the formation of carbocation intermediates in E1 reactions.
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