A substitution reaction is generally favored at the α position over the β position, which means that the arenium ion is more stable when the electrophile attaches to the α position. This difference in arenium ion stabilities is to be explained. Concept introduction: In Friedel-Crafts acylation reaction the acyl group is added to an aromatic ring. Generally, this is done by using an acid chloride and a Lewis acid catalyst such as AlCl 3 . The product of Friedel-Crafts acylation reaction involves ketone group with aromatic ring. Aromaticity is a property of cyclic, planar structures with a ring of resonance bonds. Resonance provides an extra stability due to electron delocalization.

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Chapter 23, Problem 23.59P

Interpretation Introduction

Interpretation:

A substitution reaction is generally favored at the α position over the β position, which means that the arenium ion is more stable when the electrophile attaches to the α position. This difference in arenium ion stabilities is to be explained.

Concept introduction:

In Friedel-Crafts acylation reaction the acyl group is added to an aromatic ring. Generally, this is done by using an acid chloride and a Lewis acid catalyst such as AlCl3. The product of Friedel-Crafts acylation reaction involves ketone group with aromatic ring.

Aromaticity is a property of cyclic, planar structures with a ring of resonance bonds. Resonance provides an extra stability due to electron delocalization.

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