Organic Chemistry: Principles and Mechanisms (Second Edition)
Organic Chemistry: Principles and Mechanisms (Second Edition)
2nd Edition
ISBN: 9780393663556
Author: Joel Karty
Publisher: W. W. Norton & Company
Question
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Chapter 11, Problem 11.13P
Interpretation Introduction

(a)

Interpretation:

The complete, detailed mechanism of the given reaction is to be drawn, and the major product is to be predicted.

Concept introduction:

Like carbon-carbon double bond of an alkene, the carbon-carbon triple bond of an alkyne also undergoes electrophilic addition reaction with a strong Bronsted acid. In the first step, a proton is added to a carbon-carbon triple bond to form a vinylic cation, which is then coordinated with the respective anion formed in the first step. An alkene is formed, which further shows electrophilic addition reaction with Bronsted acid to form an alkane as the final product. When alkynes are treated with excess Bronsted acid, like hydrogen halide, the geminal dihalide is formed as the major product.

Interpretation Introduction

(b)

Interpretation:

The complete, detailed mechanism of the given reaction is to be drawn, and the major product is to be predicted.

Concept introduction:

Like carbon-carbon double bond of an alkene, the carbon-carbon triple bond of an alkyne also undergoes electrophilic addition reaction with a strong Bronsted acid. In the first step, a proton is added to a carbon-carbon triple bond to form a vinylic cation, which is then coordinated with the respective anion formed in the first step. An alkene is formed, which further shows electrophilic addition reaction with Bronsted acid to form an alkane as the final product. When alkynes are treated with excess Bronsted acid, like hydrogen halide, the geminal dihalide is formed as the major product.

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Chapter 11 Solutions

Organic Chemistry: Principles and Mechanisms (Second Edition)

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