Powerful Bis-facially Pyrazolate-Bridged Dinuclear Ruthenium Epoxidation Catalyst
Aguiló Carreras, Joan (Universitat Autònoma de Barcelona. Departament de Química)
Francàs Forcada, Laia (Institut Català d'Investigació Química)
Bofill Arasa, Roger (Universitat Autònoma de Barcelona. Departament de Química)
Gil Sepulcre, Marcos (Universitat Autònoma de Barcelona. Departament de Química)
García-Antón, Jordi (Universitat Autònoma de Barcelona. Departament de Química)
Poater, Albert (Universitat de Girona. Departament de Química)
Llobet Dalmases, Antoni (Universitat Autònoma de Barcelona. Departament de Química)
Escriche Martínez, Lluís (Universitat Autònoma de Barcelona. Departament de Química)
Meyer, Franc (Georg-August-Universität. Institut für Anorganische Chemie)
Sala Román, Xavier (Universitat Autònoma de Barcelona. Departament de Química)

Data:	2015
Resum:	A new bis-facial dinuclear ruthenium complex, {[RuII(bpy)]2(μ-bimp)(μ-Cl)}2+, 22+, containing a hexadentate pyrazolate-bridging ligand (Hbimp) and bpy as auxiliary ligands has been synthesized and fully characterized in solution by spectrometric, spectroscopic, and electrochemical techniques. The new compound has been tested with regard to its capacity to oxidize water and alkenes. The in situ generated bis-aqua complex, {[RuII(bpy)(H2O)]2(μ-bimp)}3+, 33+, is an excellent catalyst for the epoxidation of a wide range of alkenes. High turnover numbers (TN), up to 1900, and turnover frequencies (TOF), up to 73 min-1, are achieved using PhIO as oxidant. Moreover, 33+ presents an outstanding stereospecificity for both cis and trans olefins toward the formation of their corresponding epoxides due to specific interactions transmitted by its ligand scaffold. A mechanistic analysis of the epoxidation process has been performed based on density functional theory (DFT) calculations in order to better understand the putative cooperative effects within this dinuclear catalyst.
Ajuts:	European Commission 293900 Ministerio de Economía y Competitividad CTQ2010-21532-C02-0 Ministerio de Economía y Competitividad TQ2011-26440 Ministerio de Economía y Competitividad CTQ-2013-49075-R Ministerio de Economía y Competitividad CTQ2014-59832-JIN
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Catalysts ; Ethers ; Hydrocarbons ; Ligands ; Organic reactions
Publicat a:	Inorganic chemistry, Vol. 54, issue 14 (2015) , p. 6782-6791, ISSN 1520-510X

DOI: 10.1021/acs.inorgchem.5b00641

Postprint 14 p, 982.6 KB

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