2-phenylethanol, a molecule extensively used in perfumery, can be prepared by treating benzene with ethylene oxide in the presence of a strong acid catalyst. Propose a mechanism for this reaction, showing all resonance forms of the sigma complex intermediate. [H+] OH

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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**Synthesis of 2-Phenylethanol from Benzene and Ethylene Oxide**

**Concept Overview:**
2-phenylethanol, a molecule extensively used in perfumery, can be synthesized by treating benzene with ethylene oxide in the presence of a strong acid catalyst. This reaction involves the formation of a sigma complex intermediate.

**Reaction Description:**
The image illustrates the chemical reaction where benzene is treated with ethylene oxide, in the presence of protons ([H⁺]) as a catalyst, to produce 2-phenylethanol.

**Reaction Components:**
- **Reactants:**
  - Benzene: Represented as a hexagon with alternating double bonds.
  - Ethylene Oxide: A three-membered cyclic ether represented as a triangle with an oxygen atom at one vertex.

- **Conditions:**
  - Presence of a strong acid catalyst ([H⁺]).

- **Product:**
  - 2-phenylethanol: Shown as a benzene ring attached to a two-carbon chain with a hydroxyl group (OH) at the end.

**Task:**
Propose a mechanism for this reaction, illustrating all resonance forms of the sigma complex intermediate. The intermediate is crucial as it determines how the ethylene oxide interacts with the benzene ring, facilitated by the acid catalyst.
Transcribed Image Text:**Synthesis of 2-Phenylethanol from Benzene and Ethylene Oxide** **Concept Overview:** 2-phenylethanol, a molecule extensively used in perfumery, can be synthesized by treating benzene with ethylene oxide in the presence of a strong acid catalyst. This reaction involves the formation of a sigma complex intermediate. **Reaction Description:** The image illustrates the chemical reaction where benzene is treated with ethylene oxide, in the presence of protons ([H⁺]) as a catalyst, to produce 2-phenylethanol. **Reaction Components:** - **Reactants:** - Benzene: Represented as a hexagon with alternating double bonds. - Ethylene Oxide: A three-membered cyclic ether represented as a triangle with an oxygen atom at one vertex. - **Conditions:** - Presence of a strong acid catalyst ([H⁺]). - **Product:** - 2-phenylethanol: Shown as a benzene ring attached to a two-carbon chain with a hydroxyl group (OH) at the end. **Task:** Propose a mechanism for this reaction, illustrating all resonance forms of the sigma complex intermediate. The intermediate is crucial as it determines how the ethylene oxide interacts with the benzene ring, facilitated by the acid catalyst.
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