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Although some limitations of related alkylation reactions (such as carbocation rearrangement and polyalkylation) have been overcome, there are some drawbacks to the Fourier acylation reaction.

① The acylation reaction produces only ketones. This is because formyl chloride decomposes into CO and HCl when exposed to these conditions.

② If the reactivity of aromatic compounds is lower than that of monohalobenzenes, they cannot participate in the reaction.

③ Aromatic amines cannot be used in this reaction because they form highly reactive complexes with Lewis acid catalysts.