Preparation and characterization of cobalt-containing alcohols and diols

A series of cobalt-containing alcohols and diols were prepared and characterized. Intramolecular hydrogen-bonding was observed for the cobalt-containing diols [Co2(CO)6(μ-η-(HO)R1R2CCCCR1R2(OH)] (1: R1 = CH3, R2 = C2H5; 2: R1 = CH3, R2 = C3H7), [Co2(CO)6(μ-η-(HO)Ph2CCCCPh2(OH)] (3) and [(μ-PPh2CH2PPh2)Co2(CO)4(μ-η-(HO)Ph2CCCCPh2(OH)] (4). Potentially all the four compounds could serve as chelating O,O-ligands. In principle, it is possible for compounds [(μ-PPh2NHPPh2)Co2(CO)4(μ-η-HCCCPh2OH)] (5b), [Co2(CO)6(μ-η-HCCC2H4OH] (6) and [Co2(CO)6(μ-η-HCCC3H6OH)] (7) in their syn-conformations to behave as chelating O,N-ligands. To the best of our knowledge, compounds 5b, 6 and 7 are the first reported examples of PPh2NHPPh2-bridged dicobalt complexes.

Several PPh2CH2PPh2- or PPh2NHPPh2-bridged cobalt-containing alcohols and diols, 1–7, were prepared and characterized. Intramolecular hydrogen bonding between two hydroxyl groups was observed for diols. Compounds 5b, 6 and 7 are the first reported examples of PPh2NHPPh2-bridged dicobalt complexes.Figure optionsDownload as PowerPoint slide