Journal Article

Highly active cationic cobalt(II) hydroformylation catalysts

Younker, Jarod M., Hood, Drew M., Carpenter, Alex E., Johnson, Ryan A., Vinyard, David J., Stanley, George G.

2020

Overview

The cobalt complexes HCo(CO)4 and HCo(CO)3(PR3) were the original industrial catalysts used for the hydroformylation of alkenes through reaction with hydrogen and carbon monoxide to produce aldehydes. More recent and expensive rhodium-phosphine catalysts are hundreds of times more active and operate under considerably lower pressures. Cationic cobalt(II) bisphosphine hydrido-carbonyl catalysts that are far more active than traditional neutral cobalt(I) catalysts and approach rhodium catalysts in activity are reported here. These catalysts have low linear-to-branched (L:B) regioselectivity for simple linear alkenes. However, owing to their high alkene isomerization activity and increased steric effects due to the bisphosphine ligand, they have high L:B selectivities for internal alkenes with alkyl branches. These catalysts exhibit long lifetimes and substantial resistance to degradation reactions.

• Publisher: American Association for the Advancement of Science,The American Association for the Advancement of Science
• Subject: Aldehydes / Alkenes / Carbon monoxide / Carbonyl compounds / Carbonyls / Catalysts / Cations / Charging / Chelation / Chemical industry / Chemical reactions / Cobalt / Cobalt compounds / Decomposition reactions / Intermediates / Isomerization / Ligands / Organic chemistry / Phosphine / Phosphines / Regioselectivity / RESEARCH ARTICLE SUMMARY / Rhodium / Steric effects