Chapter 20.3, Problem 3P

Interpretation Introduction

Interpretation:

The structural formula for an acylium ion intermediate is to be written. The structural features of acylium ion that make it a viable intermediate are to be stated.

Concept introduction:

Acylium ion or acyl cation is obtained when the removal of a halide ion takes place from a molecule of $p\text{-methoxybenzoyl chloride}$ in the presence of Lewis acid as a catalyst.

The general structural formula of the acylium ion is $\text{R}-\stackrel{+}{\text{C}}=\underset{··}{\overset{··}{\text{O}}}$.

Resonance structure is a blend of two or more Lewis structures. Resonance structures are represented by a double headed arrow between the structures.