The room temperature ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6], is used as a ‘green’ recyclable alternative to dipolar aprotic solvents for the regioselective alkylation at the heteroatom of indole and 2-naphthol.
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Earle et al. (1998) studied this question.
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