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of this proton allows rearomatization and neutralization of the cationic intermediate,
thus allowing conversion to the final product.
The reaction presented in this problem is known as a Friedel -Crafts acylation.
Technically, this example belongs to a class of reactions referred to as electrophilic
aromatic substitutions. Furthermore, the actual mechanism associated with this reac-
tion, utilizing Lewis acid reagents as catalysts, proceeds through initial formation of
an electrophilic acyl cation followed by reaction with an aromatic ring acting as a
nucleophile. This mechanism, shown below, reflects distinct parallels to standard
addition-elimination reaction mechanisms warranting introduction at this time.
7. Explain the following amide-forming reactions using arrow pushing. Specify the
structures of A, B, and C and show all relevant mechanistic steps.
