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Synthesis and structures of ruthenium–NHC complexes and their catalysis in hydrogen transfer reaction

Chao Chen, Chunxin Lu, Qing Zheng, Shengliang Ni, Min Zhang and Wanzhi Chen

Beilstein J. Org. Chem. 2015, 11, 1786–1795. https://doi.org/10.3762/bjoc.11.194

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Synthesis and structures of ruthenium–NHC complexes and their catalysis in hydrogen transfer reaction

Chao Chen, Chunxin Lu, Qing Zheng, Shengliang Ni, Min Zhang and Wanzhi Chen

Beilstein J. Org. Chem. 2015, 11, 1786–1795. https://doi.org/10.3762/bjoc.11.194

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Chen, C.; Lu, C.; Zheng, Q.; Ni, S.; Zhang, M.; Chen, W. Beilstein J. Org. Chem. 2015, 11, 1786–1795. doi:10.3762/bjoc.11.194

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TY  - JOUR
A1  - Chen, Chao
A1  - Lu, Chunxin
A1  - Zheng, Qing
A1  - Ni, Shengliang
A1  - Zhang, Min
A1  - Chen, Wanzhi
T1  - Synthesis and structures of ruthenium–NHC complexes and their catalysis in hydrogen transfer reaction
JF  - Beilstein Journal of Organic Chemistry
PY  - 2015///
VL  - 11
SP  - 1786
EP  - 1795
SN  - 1860-5397
DO  - 10.3762/bjoc.11.194
PB  - Beilstein-Institut
JA  - Beilstein J. Org. Chem.
UR  - https://doi.org/10.3762/bjoc.11.194
KW  - N-heterocyclic carbene
KW  - ruthenium
KW  - transfer hydrogenation
N2  - Ruthenium complexes [Ru(L1)2(CH3CN)2](PF6)2 (1), [RuL1(CH3CN)4](PF6)2 (2) and [RuL2(CH3CN)3](PF6)2 (3) (L1= 3-methyl-1-(pyrimidine-2-yl)imidazolylidene, L2 = 1,3-bis(pyridin-2-ylmethyl)benzimidazolylidene) were obtained through a transmetallation reaction of the corresponding nickel–NHC complexes with [Ru(p-cymene)2Cl2]2 in refluxing acetonitrile solution. The crystal structures of three complexes determined by X-ray analyses show that the central Ru(II) atoms are coordinated by pyrimidine- or pyridine-functionalized N-heterocyclic carbene and acetonitrile ligands displaying the typical octahedral geometry. The reaction of [RuL1(CH3CN)4](PF6)2 with triphenylphosphine and 1,10-phenanthroline resulted in the substitution of one and two coordinated acetonitrile ligands and afforded [RuL1(PPh3)(CH3CN)3](PF6)2 (4) and [RuL1(phen)(CH3CN)2](PF6)2 (5), respectively. The molecular structures of the complexes 4 and 5 were also studied by X-ray diffraction analysis. These ruthenium complexes have proven to be efficient catalysts for transfer hydrogenation of various ketones.
ER  -

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