Organic Chemistry: Principles And Mechanisms (second Edition)
Organic Chemistry: Principles And Mechanisms (second Edition)
2nd Edition
ISBN: 9780393630749
Author: KARTY, Joel
Publisher: W. W. Norton & Company
Question
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Chapter 14, Problem 14.65P
Interpretation Introduction

(a)

Interpretation:

The two carbocation intermediates that can be produced by the addition of a proton to the given allene are to be drawn.

Concept introduction:

Allenes are compounds with cumulated double bonds. Because of this, they are electron-rich and undergo electrophilic addition with Brønsted acids. In the first step, the proton adds generally to one carbon of the double bond forming a carbocation intermediate with the positive charge on the other carbon of the initial double bond.

Interpretation Introduction

(b)

Interpretation:

The relative stabilities of the two carbocation intermediates formed by allene are to be explained.

Concept introduction:

The stability of a carbocation depends primarily on two factors, the number of alkyl groups attached to the carbon and resonance. Resonance stabilization is generally more than the stabilization because of the inductive electron-donating nature of alkyl groups. However, resonance requires the p orbitals of adjacent carbon (or other atoms) to be parallel to the empty p orbital of the carbocation.

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Chapter 14 Solutions

Organic Chemistry: Principles And Mechanisms (second Edition)

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