Pressure Dependence of the Carbon Dioxide/Cyclohexene Oxide Coupling Reaction Catalyzed by Chromium Salen Complexes. Optimization of the Comonomer-Alternating Enchainment Pathway

2005 ◽  
Vol 24 (1) ◽  
pp. 144-148 ◽  
Author(s):  
Donald J. Darensbourg ◽  
Ryan M. Mackiewicz ◽  
Damon R. Billodeaux
Keyword(s):  
Carbon Dioxide ◽  
Pressure Dependence ◽  
Coupling Reaction ◽  
Cyclohexene Oxide ◽  
Salen Complexes

Carbon dioxide/propylene oxide coupling reaction catalyzed by chromium salen complexes

Polymer ◽  
2009 ◽  
Vol 50 (2) ◽  
pp. 441-446 ◽  
Author(s):  
Yongsheng Niu ◽  
Wanxi Zhang ◽  
Hongchun Li ◽  
Xuesi Chen ◽  
Jingru Sun ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Propylene Oxide ◽  
Coupling Reaction ◽  
Salen Complexes

Chiral titanium(IV) and vanadium(V) salen complexes as catalysts for carbon dioxide and epoxide coupling reactions

Tetrahedron ◽  
2021 ◽  
Vol 82 ◽  
pp. 131929
Author(s):  
Svetlana A. Kuznetsova ◽  
Ilia V. Gorodishch ◽  
Alexander S. Gak ◽  
Valeria V. Zherebtsova ◽  
Igor S. Gerasimov ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Coupling Reactions ◽  
Salen Complexes

Heteroscorpionate Rare-Earth Catalysts for the Low-Pressure Coupling Reaction of CO2 and Cyclohexene Oxide

2021 ◽  
Author(s):  
Felipe de la Cruz-Martínez ◽  
Marc Martínez de Sarasa Buchaca ◽  
Juan Fernández-Baeza ◽  
Luis F. Sánchez-Barba ◽  
Ana M. Rodríguez ◽  
...  
Keyword(s):  
Rare Earth ◽  
Coupling Reaction ◽  
Low Pressure ◽  
Cyclohexene Oxide

Salen ligand complexes as electrocatalysts for direct electrochemical reduction of gaseous carbon dioxide to value added products

RSC Advances ◽  
2015 ◽  
Vol 5 (5) ◽  
pp. 3581-3589 ◽  
Author(s):  
Surya Singh ◽  
Bedika Phukan ◽  
Chandan Mukherjee ◽  
Anil Verma
Keyword(s):  
Carbon Dioxide ◽  
Electrochemical Reduction ◽  
Value Added ◽  
Salen Complexes ◽  
Gaseous Carbon Dioxide ◽  
Salen Ligand ◽  
Centrosymmetric Molecule ◽  
Value Added Products

CO2, being a linear and centrosymmetric molecule, is very stable, and the electrochemical reduction of CO2 requires energy. However, the salen complexes are found to be very efficient to minimize overpotential as compared to their metal counterparts.

Catalytic performance of a series of guanidinium-based ionic liquids in the coupling reaction of carbon dioxide with epoxides

RSC Advances ◽  
2016 ◽  
Vol 6 (90) ◽  
pp. 87036-87043 ◽  
Author(s):  
Ping Li ◽  
Ya Li ◽  
Ci Chen ◽  
Li Wang ◽  
Jinglai Zhang
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquids ◽  
Cycloaddition Reaction ◽  
Coupling Reaction ◽  
Catalytic Performance

The cycloaddition reaction of CO2 into EO, catalyzed by a series of functional guanidinium-based ionic liquids, is schematically studied by the DFT.

Alternating Copolymerization of Carbon Dioxide with Cyclohexene Oxide Catalyzed by a Novel Catalyst

2012 ◽  
Vol 549 ◽  
pp. 445-448
Author(s):  
Li Dan Fan ◽  
Gang Qin ◽  
Xin Xin Cao ◽  
Shao Kui Cao
Keyword(s):  
Carbon Dioxide ◽  
Catalytic Activity ◽  
Reaction Time ◽  
Zinc Complex ◽  
Cyclohexene Oxide ◽  
Novel Catalyst ◽  
Alternating Copolymerization

A novel catalyst for the copolymerization of CO2 and cyclohexene oxide(CHO) was prepared by using BTE and ZnCl2. The zinc complex showed catalytic activity for the copolymerization. The obtained copolymer was characterized by IR and NMR. Effect of reaction time on copolymerization was investigated.

scholarly journals Study on Thermal Decomposition Behaviors of Terpolymers of Carbon Dioxide, Propylene Oxide, and Cyclohexene Oxide

2018 ◽  
Vol 19 (12) ◽  
pp. 3723 ◽  
Author(s):  
Shaoyun Chen ◽  
Min Xiao ◽  
Luyi Sun ◽  
Yuezhong Meng
Keyword(s):  
Carbon Dioxide ◽  
Thermal Stability ◽  
Thermal Decomposition ◽  
Thermogravimetric Analysis ◽  
Propylene Carbonate ◽  
Cyclohexene Oxide ◽  
Block Polymers ◽  
Rate Method ◽  
Poly Propylene ◽  
Thermal Stability Of

The terpolymerization of carbon dioxide (CO2), propylene oxide (PO), and cyclohexene oxide (CHO) were performed by both random polymerization and block polymerization to synthesize the random poly (propylene cyclohexene carbonate) (PPCHC), di-block polymers of poly (propylene carbonate–cyclohexyl carbonate) (PPC-PCHC), and tri-block polymers of poly (cyclohexyl carbonate–propylene carbonate–cyclohexyl carbonate) (PCHC-PPC-PCHC). The kinetics of the thermal degradation of the terpolymers was investigated by the multiple heating rate method (Kissinger-Akahira-Sunose (KAS) method), the single heating rate method (Coats-Redfern method), and the Isoconversional kinetic analysis method proposed by Vyazovkin with the data from thermogravimetric analysis under dynamic conditions. The values of ln k vs. T−1 for the thermal decomposition of four polymers demonstrate the thermal stability of PPC and PPC-PCHC are poorer than PPCHC and PCHC-PPC-PCHC. In addition, for PPCHC and PCHC-PPC-PCHC, there is an intersection between the two rate constant lines, which means that, for thermal stability of PPCHC, it is more stable than PCHC-PPC-PCHC at the temperature less than 309 °C and less stable when the decomposed temperature is more than 309 °C. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and thermogravimetric analysis/infrared spectrometry (TG/FTIR) techniques were applied to investigate the thermal degradation behavior of the polymers. The results showed that unzipping was the main degradation mechanism of all polymers so the final pyrolysates were cyclic propylene carbonate and cyclic cyclohexene carbonate. For the block copolymers, the main chain scission reaction first occurs at PC-PC linkages initiating an unzipping reaction of PPC chain and then, at CHC–CHC linkages, initiating an unzipping reaction of the PCHC chain. That is why the T−5% of di-block and tri-block polymers were not much higher than that of PPC while two maximum decomposition temperatures were observed for both the block copolymer and the second one were much higher than that of PPC. For PPCHC, the random arranged bulky cyclohexane groups in the polymer chain can effectively suppress the backbiting process and retard the unzipping reaction. Thus, it exhibited much higher T−5% than that of PPC and block copolymers.

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