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Friedel-Crafts alkylation and Acylation reactions are normally in the special class of the electrophilic aromatic substitution where the underlying electrophile is either a carbocation or acylium ion. The reaction is highly significant since it entail carbon-carbon bond…
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Download file to see previous pages e clemmensen reduction route normally hinders secondary alkyl substitution that results from corresponding carbocation on rearrangement (Klein, 195-269). Nevertheless, in direct alkylation, the underlying ratio of the primary to secondary alkyl substitution can differ depending on the existing aromatic substrate and reaction conditions.
Acyl halide first reacts with the underlying Lewis acid resulting to formation of more electrophilic C, an acylium ion. The n-electrons of the underlying aromatic C=C which act as nucleophile then attack the electrophilic C+ thereby destroying aromaticity resulting to the cyclohexadienyl cation intermediate. Finally proton is removed from sp3 C bearing the acyl-group reforms the corresponding C=C and the required aromatic system resulting to the creation of HCl and regeneration of the active catalyst.
The reaction commence with the generation of methyl carbonation from the corresponding methyl bromide. Carbonation then reacts with underlying n electron system of the benzene in order to form a nonaromatic carbocation that subsequently loses a proton to in order to regenerate aromaticity of the system (Klein, 53-134). The reaction takes place in steps with an electrophile formation via reaction of the methylchlorine and aluminium ...Download file to see next pagesRead More
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