Ruthenium NNN complexes with a 2‐hydroxypyridylmethylene fragment for transfer hydrogenation of ketones |
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| Authors: | Jing Shi Shu Shang Bowen Hu Dafa Chen |
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| Affiliation: | MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, China |
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| Abstract: | Four NNN tridentate ligands L1–L4 containing 2‐methoxypyridylmethene or 2‐hydroxypyridylmethene fragment were synthesized and introduced to ruthenium centers. When (HOC5H3NCH2C5H3NC5H7N2) (L2) and (HOC5H3NCH2C5H3NC6H6N3) (L4) reacted with RuCl2(PPh3)3, two ruthenium chloride products Ru(L2)(PPh3)Cl2 ( 1 ) and Ru(L4)(PPh3)Cl2 ( 2 ) were isolated, respectively. Reactions of (MeOC5H3NCH2C5H3NC5H7N2) (L1) and (MeOC5H3NCH2C5H3NC6H6N3) (L3) with RuCl2(PPh3)3 in the presence of NH4PF6 generated two dicationic complexes Ru(L1)2]PF6]2 ( 3 ) and Ru(L3)2]PF6]2 ( 4 ), respectively. Complex 1 reacted with CO to afford product Ru(L2)(PPh3)(CO)Cl]Cl]. The catalytic activity for transfer hydrogenation of ketones was investigated. Complex 1 showed the highest activity, with a turnover frequency value of 1.44 × 103 h?1 for acetophenone, while complexes 3 and 4 were not active. |
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| Keywords: | [Fe]‐hydrogenase 2‐hydroxypyridyl metal– ligand cooperation ruthenium transfer hydrogenation |
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