%0 Generic %A Chai, Huining %A Liu, Tingting %A Wang, Qingfu %A Yu, Zhengkun %D 2015 %T Substituent Effect on the Catalytic Activity of Ruthenium(II) Complexes Bearing a Pyridyl-Supported Pyrazolyl-Imidazolyl Ligand for Transfer Hydrogenation of Ketones %U https://acs.figshare.com/articles/dataset/Substituent_Effect_on_the_Catalytic_Activity_of_Ruthenium_II_Complexes_Bearing_a_Pyridyl_Supported_Pyrazolyl_Imidazolyl_Ligand_for_Transfer_Hydrogenation_of_Ketones/2111272 %R 10.1021/acs.organomet.5b00727.s003 %2 https://ndownloader.figshare.com/files/3744559 %K Substituent Effect %K NNN ligand %K order NHTs %K Catalytic Activity %K imidazolyl moiety %K 345 600 %K RuH complexes %K NMR %K TOF value %K transfer hydrogenation %K Transfer Hydrogenation %X Air- and moisture-stable ruthenium­(II) complexes bearing a multisubstituted pyrazolyl-imidazolyl-pyridine ligand were synthesized and structurally characterized by NMR and X-ray single-crystal crystallographic analyses. The substituents on the imidazolyl moiety of the NNN ligand exhibited a remarkable impact on the catalytic activity of the corresponding Ru­(II) complexes for transfer hydrogenation of ketones in refluxing 2-propanol, following the order NHTs > Me > H > NO2, to tune the catalytic activity. The highest final TOF value of 345 600 h–1 was reached by means of 0.05 mol % of the Ru­(II)-NHTs-substituted NNN complex as the catalyst. The corresponding structurally confirmed RuH complexes are proposed as the catalytically active species. %I ACS Publications