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• W2963965503 abstract "A series of dimeric aluminum compounds [Al(OCMe2 CH2 N(R)CH2 X)]2 [X=pyridin-2-yl, R=H (PyrH ); X= pyridin-2-yl, R=Me (PyrMe ); X=furan-2-yl, R=H (FurH ); X= furan-2-yl, R=Me (FurMe ); X=thiophen-2-yl, R=H (ThioH ); X= thiophen-2-yl, R=Me (ThioMe )] containing heterocyclic pendant group attached to the nitrogen catalyze the coupling of CO2 with epoxides under ambient conditions. In a comparison of their catalytic activities with those of aluminum complexes without pendant groups at N [X=H, R=H (HH ); X=H, R=Me (HMe )] or with non-heterocyclic pendant groups [X=CH2 CH2 OMe, R=H (OMeH ); X=CH2 CH2 NMe2 , R=H (NMe2H ); X=CH2 CH2 NMe2 , R=Me (NMe2Me )], complexes containing heterocycles, in conjunction with (nBu)4 NBr as a cocatalyst, show higher catalytic activities for the synthesis of cyclic carbonates under the same ambient conditions. The best catalyst system for this reaction is PyrH /(nBu)4 NBr system, which gives a turnover number of 99 and a turnover frequency of 4.1 h-1 , making it 14- and 20-times more effective than HH /(nBu)4 NBr and HMe /(nBu)4 NBr, respectively. Although there are no direct interactions between the aluminum and the heteroatoms in the heterocyclic pendants, electronic effects combined with the increased local concentration of CO2 around the active centers influences the catalytic activity in the coupling of CO2 with epoxides. In addition, PyrH /(nBu)4 NBr shows broad epoxide substrate scope and seven terminal epoxides and two internal epoxides undergo the designed reaction." @default.
• W2963965503 created "2019-07-30" @default.
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• W2963965503 date "2019-08-09" @default.
• W2963965503 modified "2023-10-17" @default.
• W2963965503 title "Efficient Aluminum Catalysts for the Chemical Conversion of CO ₂ into Cyclic Carbonates at Room Temperature and Atmospheric CO ₂ Pressure" @default.
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• W2963965503 doi "https://doi.org/10.1002/cssc.201901661" @default.
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