A new approach to the preparation of lanthanide catalysts for the synthesis of 2-propyl-3-ethylquinoline based on the reactions of LnCl3 · 6H2O crystalline hydrates with triisobutylaluminum |
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| Authors: | R. G. Bulgakov S. P. Kuleshov A. R. Makhmutov R. R. Vafin D. S. Karamzina M. T. Golikova Ya. V. Shestopal S. M. Usmanov U. M. Dzhemilev |
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| Affiliation: | (1) Institute of Petrochemistry and Catalysis, Academy of Sciences of Bashkortostan, Ufa Scientific Center, Russian Academy of Sciences, Ufa, 450075, Bashkortostan, Russia;(2) Birsk State Pedagogical Institute, Birsk, 452320, Bashkortostan, Russia |
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| Abstract: | A new approach to the preparation of lanthanide catalysts for the synthesis of nitrogen heterocycles (exemplified by 2-propyl-3-ethylquinoline) was developed based on the reactions of LnCl3 · 6H2O crystalline hydrates with alkylaluminums. It was found that the interaction of LnCl3 · 6H2O (Ln = Ce, Pr, Tb, and Eu) with iso-Bu3Al in aromatic solvents (20°C) resulted in the formation of soluble (isobutane and the alumoxane (iso-Bu2Al)2O) and insoluble products (with the empirical formula LnCl3 · xH2O · y(iso-Bu2Al)2O (x = 0.4–0.7; y = 0.04–0.07)). The physiochemical properties of LnCl3 · xH2O · y(iso-Bu2Al)2O were studied, and these compounds were found to be highly efficient catalysts for the reaction of aniline condensation with butyraldehyde to form 2-propyl-3-ethylquinoline. |
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