O.[Ru:2](Cl)(Cl)Cl.[Ru].[CH3:7][C:8](=[O:13])[CH2:9][C:10](=[O:12])[CH3:11].C([O-])(O)=O.[Na+]>O>[CH3:11][C:10]([CH2:9][C:8]([CH3:7])=[O:13])=[O:12].[CH3:11][C:10]([CH2:9][C:8]([CH3:7])=[O:13])=[O:12].[CH3:11][C:10]([CH2:9][C:8]([CH3:7])=[O:13])=[O:12].[Ru:2]A ruthenium trichloride hydrate was placed in a separable flask of 5 L in volume so as to contain 80.15 g of ruthenium. To the flask, further 3,500 mL of water and 297.5 g of 2,4-pentanedione were added and refluxed in the air for 2 hours. To the resultant solution, 330 g of sodium acid carbonate was added and refluxed for another 2 hours. From the obtained reaction solution, the organic phase was extracted, vaporized, and dried to obtain 285.3 g of tris(2,4-pentanedionato)ruthenium as a red crystal.
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