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Chiral Cobalt(III) Complexes as Bifunctional Brønsted Acid–Lewis Base Catalysts for the Preparation of Cyclic Organic Carbonates
Author(s) -
Rulev Yuri A.,
Larionov Vladimir A.,
Lokutova Anastasia V.,
Moskalenko Margarita A.,
Lependina Ol'ga L.,
Maleev Victor I.,
North Michael,
Belokon Yuri N.
Publication year - 2016
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201501365
Subject(s) - chemistry , cobalt , catalysis , epoxide , bifunctional , kinetic resolution , cyclohexene oxide , lewis acids and bases , bimetallic strip , inorganic chemistry , polymer chemistry , organic chemistry , enantioselective synthesis
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.