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Tytuł: Ruthenium(II) carbonyl complexes containing pyridoxalthiosemicarbazone and trans-bis(triphenylphosphine/arsine):Synthesis, structure and their recyclable catalysis of nitriles to amidesand synthesis of imidazolines
Autor: Manikandan, Rajendran
Anitha, Panneerselvam
Prakash, Govindan
Vijayan, Paranthaman
Viswanathamurthi, Periasamy
Butcher, Ray Jay
Małecki, Jan Grzegorz
Słowa kluczowe: Ru(II) carbonyl complexes; Crystal structure; Hydration of nitriles; Recyclable catalyst; 2-imidazolines
Data wydania: 2015
Wydawca: Elsevier
Źródło: Journal of Molecular Catalysis A: Chemical, Vol. 398 (2015), s. 312-324
Abstrakt: tPyridoxal N(4)-substituted thisemicarbazone hydrochloride ligands (L1–3) were synthesized and reactedwith the ruthenium(II) starting complexes [RuHCl(CO)(EPh3)3] (E P or As). The resulting complexes[Ru(CO)(L1–3)(EPh3)2] (1–6) were characterized by elemental analyses and spectroscopic techniques. Themolecular structure of complex 5 was identified by means of single crystal X-ray diffraction analysis. Thecatalytic activity of the new complexes was evaluated for the selective hydration of nitriles to primaryamides and also the condensation of nitriles with ethylenediamine under solvent free conditions. Theprocesses were operative with aromatic, heteroaromatic and aliphatic nitriles, and tolerated severalsubstitutional groups. The studies on the effect of substitution over thiosemicarbazone, reaction time,temperature, solvent and catalyst loading were carried out in order to find the best catalyst in this seriesof complexes and favourable reaction conditions. A probable mechanism for both the catalytic reactionsof nitrile has also been proposed. The catalyst was recovered and recycled in the hydration of nitriles forfive times without any significant loss of its activity
DOI: 10.1016/j.molcata.2014.12.017
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