The phenylation of methylquinolines by nucleogenic phenyl cations was studied. This reaction led to a product mixture through electrophilic addition and electrophilic substitution, with composition depending on the methyl substituent position. In the case of 4-methylquinoline, the electron-donating methyl group in the para position markedly increased the yield of N-phenylquinolinium derivative, while the low yield of the quinolinium salt in the case of 8-methylquinoline was due to the two factors - low basicity of the nitrogen atom in comparison to 4-methylquinoline and steric hindrance by the methyl group, which led to predominant electrophilic substitution.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 461-467, March, 2013.
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Shchepina, N.E., Avrorin, V.V., Alexandrova, G.A. et al. Investigation of the phenylation of methyl-quinolines using tritium-labeled nucleogenic phenyl cations. Chem Heterocycl Comp 49, 428–434 (2013). https://doi.org/10.1007/s10593-013-1264-7
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DOI: https://doi.org/10.1007/s10593-013-1264-7