Conclusion
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1.
In the series of chlorides of zinc, aluminum, iron(III), nickel(II), and cobalt(II), zinc chloride is the most active and selective reagent for stoichiometric indolization of phenylhydrazones in the liquid phase.
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2.
In the presence of laminar graphite compounds, indolization of phenylhydrazones with zinc chloride has a catalytic character.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1585–1589, July, 1984.