1. Furopyridines. II. Bromination and Nitration of Furo[2,3-b]-, Furo[3,2-b]-, Furo[2,3-c]- and Furo[3,2-c]pyridine
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Journal of Heterocyclic Chemistry, 1984, Volume 21, pp. 725-736
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https://www.jhetchem.com/cd2html.php?file=19840725A. Walser, R. Ian Fryer
Journal of Heterocyclic Chemistry, 1983, Volume 20, pp. 551-558
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https://www.jhetchem.com/cd2html.php?file=19830551Agnieszka Puchala, Ferdinand Belaj, Jan Bergman, C. Oliver Kappe
Journal of Heterocyclic Chemistry, 2001, Volume 38, Issue 6, pp. 1345-1352
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https://www.jhetchem.com/cd2html.php?file=20011345