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1-Benzyl-2-alkyl-4,5-dihydroimidazoles have been (laterally) metallated and C-alkylated by reaction with alkyl halides and an epoxide; intramolecular C-alkylation has led to a tetrahydro-5H-pyrrolo-[1,2-a]imidazole. Hydrolysis of the 4,5-dihydroimidazoles to produce alkanoic acids completes a homologation sequence.
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Anderson et al. (1986) studied this question.
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