Thermal indolisation of 4-pyridylhydrazones has yielded a series of 1,5-diazaindenes (pyrrolo[3,2-c]pyridines), and 3-pyridylhydrazones similarly gave mixtures of a 1,4-diazaindene (pyrrolo[3,2-b]pyridine)(major isomer) and a 1,6-diazaindene (pyrrolo[2,3-c]pyridine). Correlations of structure with t.l.c. behaviour and with u.v. and i.r. spectra are discussed.
A. H. Kelly and J. Parrick, J. Chem. Soc. C, 1970, 303 DOI: 10.1039/J39700000303
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