Abstract
1. The efficiency of the catalytic system containing Co(O) and various ligands (phosphines, diphosphines, phosphites, and diamines) in the intramolecular hydroacylation reaction is greatest when using chelating diphosphines 1,2-bis(diphenylphosphino)ethane and 1,2-bis(diphenylphosphino)propane (ligand:Co=1∶:1). 2. For monodentate phosphorus-containing ligands, the activity and selectivity of the catalytic system increase with increasing donor capacity and decreasing bulk of the ligands. 3. In the presence of the Co2(μ-N2)(PPh3)6 + 1,2-bis(diphenylphosphino)ethane catalytic system, 4-pentenal cyclizes to cyclopentanone in acetonitrile at 70°C with about 100% selectivity at complete conversion (20 moles per g-at Co).
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