Coupling of carbon dioxide with neat propylene oxide catalyzed by aminebisphenolato cobalt(II)/(III) complexes and ionic co-catalysts

Cyclohexene oxide/carbon dioxide copolymerization by chromium(iii) amino-bis(phenolato) complexes and MALDI-TOF MS analysis of the polycarbonates

“…6 Also, CO 2 can be considered a renewable resource, 7 so its utilization is preferred over dwindling fossil fuels that are still the main basis for commercial polycarbonate synthesis. For example, complexes with Zn, [10][11][12] Al, 13 Co, [14][15][16][17][18][19][20][21] Fe, [22][23] Mg, 24 and Cr [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] have proven to be active in CO 2 /epoxide copolymerization. 9 Recently, a large number of complexes have been developed as active catalyst precursors for the copolymerization of CO 2 and epoxides.…”

A MALDI-TOF MS analysis study of the binding of 4-(N,N-dimethylamino)pyridine to amine-bis(phenolate) chromium(iii) chloride complexes: mechanistic insight into differences in catalytic activity for CO2/epoxide copolymerization

“…65 By far the most widely studied ligands for epoxide/CO 2 copolymerization have been the Salen [3][4][5] and, more recently, the Salan ligands, which have been primarily used with Cr ( Fig. [68][69][70][71] This ligand offers possibilities for development of potentially highly active catalysts because of the modifiable nature of the donor sites, their steric and electronic properties, and their geometry, which differs from that exhibited by the Salen and Salan-based systems. Whereas compounds of the Salen and Salan ligands represent the most investigated homogeneous systems for CO 2 /epoxide copolymerization, we have been interested in the use of the related tetradentate amine-bis(phenolato) ligand class.…”

Amine‐bis(phenolato)cobalt(II) Catalysts for the Formation of Organic Carbonates from Carbon Dioxide and Epoxides

“…[34] Published reports of Co II catalysts for the coupling of CO 2 and epoxides are rare and limited to Co(OAc) 2 with acetic acid as co-catalyst for a substantial period of time (TOF = 0.06 h -1 ). [43][44][45] The amine-bis(phenolate) ligand structure is versatile and offers numerous possibilities for electronic and steric alteration. [40] In 2010, Williams et al successfully synthesized bimetallic Co II (TOF = 172 h -1 ) and mixed metallic Co II /Co III (TOF = 159 h -1 ) catalysts which were active for the copolymerization of CHO/CO 2 at ambient pressure.…”

“…[41,42] Recently, amine-bis(phenolato) catalysts were introduced for the coupling of CO 2 and epoxides. [42][43][44]55,56] The increased Lewis acidity of Co III is generally advantageous for copolymerization; it facilitates epoxide activation and ring opening and concomitantly suppresses the undesired dissociation of the growing polymer chain from the metal and subsequent back-biting. [43][44][45] The amine-bis(phenolate) ligand structure is versatile and offers numerous possibilities for electronic and steric alteration.…”