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Specifically for dimethoxybenzene, why is it difficult to stop the reaction after one alkylation and indeed,...

Specifically for dimethoxybenzene, why is it difficult to stop the reaction after one alkylation and indeed, why is the dialkylated product expected to be the predominant product? Asked differently, why is it difficult, if not impossible, to stop the reaction after one alkylation even if you make the dimethoxybenzene the limiting reagent?

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