title: Chiral Cobalt(III) Complexes as Bifunctional Brønsted Acid-Lewis Base Catalysts for the Preparation of Cyclic Organic Carbonates.
abstract: Stereochemically inert cationic cobalt(III) complexes were shown to be one-component catalysts for the synthesis of cyclic carbonates from epoxides and carbon dioxide at 50 °C and 5 MPa carbon dioxide pressure. The optimal catalyst possessed an iodide counter anion and could be recycled. A catalytic cycle is proposed in which the ligand of the cobalt complexes acts as a hydrogen-bond donor, activating the epoxide towards ring opening by the halide anion and activating the carbon dioxide for subsequent reaction with the halo-alkoxide. No kinetic resolution was observed when terminal epoxides were used as substrates, but chalcone oxide underwent kinetic resolution.
authors.affiliation: Nesmeyanov Institute of Organoelement Compounds, Moscow, 19991, Russia.
authors.forename: Yuri A
authors.initials: YA
authors.lastname: Rulev
authors.affiliation: Nesmeyanov Institute of Organoelement Compounds, Moscow, 19991, Russia.
authors.forename: Vladimir A
authors.initials: VA
authors.lastname: Larionov
authors.affiliation: Nesmeyanov Institute of Organoelement Compounds, Moscow, 19991, Russia.
authors.forename: Anastasia V
authors.initials: AV
authors.lastname: Lokutova
authors.affiliation: Nesmeyanov Institute of Organoelement Compounds, Moscow, 19991, Russia.
authors.forename: Margarita A
authors.initials: MA
authors.lastname: Moskalenko
authors.affiliation: Nesmeyanov Institute of Organoelement Compounds, Moscow, 19991, Russia.
authors.forename: Ol'ga L
authors.initials: OL
authors.lastname: Lependina
authors.affiliation: Nesmeyanov Institute of Organoelement Compounds, Moscow, 19991, Russia.
authors.forename: Victor I
authors.initials: VI
authors.lastname: Maleev
authors.affiliation: Green Chemistry Centre of Excellence, Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK. Michael.North@york.ac.uk.
authors.forename: Michael
authors.initials: M
authors.lastname: North
authors.affiliation: Nesmeyanov Institute of Organoelement Compounds, Moscow, 19991, Russia. yubel@ineos.ac.ru.
authors.forename: Yuri N
authors.initials: YN
authors.lastname: Belokon
mesh_terms: D002254:Carbonates / Q000138:chemical synthesis* / Q000737:chemistry*; D002384:Catalysis; D060326:Chemistry Techniques, Synthetic; D003035:Cobalt / Q000737:chemistry*; D058115:Lewis Bases / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D002254:Carbonates; D058115:Lewis Bases; D009942:Organometallic Compounds; D003035:Cobalt
keywords: carbon dioxide; catalyst; cyclic carbonate; epoxide; kinetic resolution