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Ru (II) complexes containing dmso and pyrazolyl ligands as catalysts for nitrile hydration in environmentally friendly media

The synthesis of two Ru-dmso complexes containing the ligands 2-(3-pyrazolyl)pyridine (pypz-H), and pyrazole (pz-H), [RuIICl 2(pypz-H)(dmso)2], (2) and [RuIICl 2(pz-H)(dmso)3], (3), has been described. Both complexes have been fully characterized in solution through 1H-NMR and UV-Vis techniques and also in the solid state through monocrystal X-ray diffraction analysis. The redox properties of both complexes have also been studied by means of cyclic voltammetry. Exposure of 2 to visible light in acetonitrile produces a substitution of one dmso ligand by a solvent molecule generating a new complex, [RuIICl2(MeCN)(pypz-H)(dmso)] (4). Also, UV-visible spectroscopy points out that complex 2 presents a thermal and photochemical substitution of dmso ligands in aqueous solution. Finally, the reactivity of complexes 2 and 3 has been tested with regard to the hydration of nitriles using water as a single solvent, displaying good efficiency and selectivity for the corresponding amide derivatives. In general, better performance is achieved with complex 3. Reuse of these catalysts in water and glycerol has been explored for the first time in ruthenium-mediated nitrile hydration catalysis

This research has been financed by MICINN of Spain (CTQ2010-21532-C02-01)

© Dalton Transactions, 2013, vol. 42, núm. 37, p. 13461-13469

Royal Society of Chemistry (RSC)

Autor: Ferrer Vall-llosada, Íngrid
Rich Masallera, Jordi
Fontrodona, Xavier
Rodríguez Pizarro, Montserrat
Romero García, Isabel
Data: 7 octubre 2013
Resum: The synthesis of two Ru-dmso complexes containing the ligands 2-(3-pyrazolyl)pyridine (pypz-H), and pyrazole (pz-H), [RuIICl 2(pypz-H)(dmso)2], (2) and [RuIICl 2(pz-H)(dmso)3], (3), has been described. Both complexes have been fully characterized in solution through 1H-NMR and UV-Vis techniques and also in the solid state through monocrystal X-ray diffraction analysis. The redox properties of both complexes have also been studied by means of cyclic voltammetry. Exposure of 2 to visible light in acetonitrile produces a substitution of one dmso ligand by a solvent molecule generating a new complex, [RuIICl2(MeCN)(pypz-H)(dmso)] (4). Also, UV-visible spectroscopy points out that complex 2 presents a thermal and photochemical substitution of dmso ligands in aqueous solution. Finally, the reactivity of complexes 2 and 3 has been tested with regard to the hydration of nitriles using water as a single solvent, displaying good efficiency and selectivity for the corresponding amide derivatives. In general, better performance is achieved with complex 3. Reuse of these catalysts in water and glycerol has been explored for the first time in ruthenium-mediated nitrile hydration catalysis
This research has been financed by MICINN of Spain (CTQ2010-21532-C02-01)
Format: application/pdf
ISSN: 1477-9226 (versió paper)
1477-9234 (versió electrònica)
Accés al document: http://hdl.handle.net/10256/11726
Llenguatge: eng
Editor: Royal Society of Chemistry (RSC)
Col·lecció: MICINN/PN 2011-2014/CTQ2010-21532-C02-01
Reproducció digital del document publicat a: http://dx.doi.org/10.1039/C3DT51580J
Articles publicats (D-Q)
És part de: © Dalton Transactions, 2013, vol. 42, núm. 37, p. 13461-13469
Drets: Tots els drets reservats
Matèria: Ruteni -- Compostos
Ruthenium compounds
Catàlisi
Catalysis
Hidròlisi
Hydrolysis
Títol: Ru (II) complexes containing dmso and pyrazolyl ligands as catalysts for nitrile hydration in environmentally friendly media
Tipus: info:eu-repo/semantics/article
Repositori: DUGiDocs

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