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Ruthenium(II) Picolyl-NHC Complexes: Synthesis, Characterization, and Catalytic Activity in Amine N‑alkylation and Transfer Hydrogenation Reactions

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URI: http://hdl.handle.net/10498/20433

DOI: 10.1021/om300692a

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2012-Ruthenium(II) picolyl-NHC complexes. Synthesis, characterization, and catalytic activity in amine N-alkylation and transfer hydrogenation reactions.pdf (1.179Mb)
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Author/s
E. Fernández, Francys; Puerta Vizcaino, María del Carmen; Valerga Jiménez, Pedro Sixto
Date
2012-09
Department
Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
Source
Organometallics 2012, 31, 6868−6879
Abstract
Ruthenium(II) p-cymene complexes with picolylfunctionalized N-heterocyclic carbenes [(η6-p-cymene)Ru(L)(Cl)]- [PF6] (L = 3-methyl-1-(2-picolyl)imidazol-2-ylidene (1a), 3- isopropyl-1-(2-picolyl)imidazol-2-ylidene (1b), 3,4,5-trimethyl- 1-(2-picolyl)imidazol-2-ylidene (1c), 3-mesityl-1-(2-picolyl)- imidazol-2-ylidene (1d), 3-methyl-1-(2-picolyl)benzoimidazol- 2-ylidene (1e), 3-methyl-1-(2-picolyl)-4,5-dichloroimidazol-2- ylidene (1f), 3-phenyl-1-(2-picolyl)imidazol-2-ylidene (1g)) have been synthesized and characterized. Compounds 1a−g were recrystallized, and X-ray crystal structures are reported for 1a,f. Furthermore, compounds 1a−f show catalytic activity in transfer hydrogenation of ketones and N-alkylation of amines. Notably, complexes 1a,c,f were found to be very efficient and versatile catalysts toward transfer hydrogenation of a wide range of ketones and imines in addition to N-alkylation of several amines.
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