5586-64-1Relevant articles and documents
Interfacial Frustrated Lewis Pairs of CeO2 Activate CO2 for Selective Tandem Transformation of Olefins and CO2 into Cyclic Carbonates
Zhang, Sai,Xia, Zhaoming,Zou, Yong,Cao, Fangxian,Liu, Yuxuan,Ma, Yuanyuan,Qu, Yongquan
supporting information, p. 11353 - 11357 (2019/08/20)
Effective activation of CO2 is a prerequisite for efficient utilization of CO2 in organic synthesis. Precisely controlling the interfacial events of solids shows potential for activation. Herein, defect-enriched CeO2 with constructed interfacial frustrated Lewis pairs (FLPs, two adjacent Ce3+···O2-) effectively activates CO2 via the interactions between C/Lewis basic lattice O2- and the two O atoms in CO2/two adjacent Lewis acidic Ce3+ ions. Selective cyclic carbonate production from a catalytically tandem protocol of olefins and CO2 is used to demonstrate FLP-inspired CO2 activation.
Efficient Catalytic System Involving Molybdenyl Acetylacetonate and Immobilized Tributylammonium Chloride for the Direct Synthesis of Cyclic Carbonates from Carbon Dioxide and Olefins
Siewniak, Agnieszka,Jasiak-Jaroń, Katarzyna,Kotyrba, ?ukasz,Baj, Stefan
, p. 1567 - 1573 (2017/05/16)
Abstract: An effective direct method for preparing of cyclic carbonates from CO2 and olefins in the presence of tert-butyl hydroperoxide as an oxidant was provided. The first stage, the epoxidation of olefins, was carried out using MoO2(acac)2 as a catalyst (1h, 100 °C), and the second stage, the cycloaddition of CO2 to the resulting epoxide, was proceeded in the presence of immobilized tributylmethylammonium chloride on a polystyrene cross-linked with divinylbenzene, and an aqueous solution of ZnBr2 (100 °C, 0.9?MPa of CO2, 4?h). The proposed method allowed to obtain cyclic carbonates with high yields (50–77%) under mild conditions. Moreover, the immobilized catalyst could be reused at least five times without significant loss of its catalytic activity.
Cooperative catalysis of cyclic carbonate ring opening: Application towards non-isocyanate polyurethane materials
Lombardo, Vince M.,Dhulst, Elizabeth A.,Leitsch, Emily K.,Wilmot, Nathan,Heath, William H.,Gies, Anthony P.,Miller, Matthew D.,Torkelson, John M.,Scheidt, Karl A.
, p. 2791 - 2795 (2015/05/05)
The reaction between cyclic carbonates and amines to produce hydroxyurethanes is an important alternative to current urethane chemistry. In order to address the issue of slow reaction rates, an efficient ring opening of cyclic carbonates with amines has been achieved utilizing cooperative catalysis. A new Lewis acid/Lewis base combination substantially decreases the reaction times for small molecule systems to reach complete conversion. Although triazabicyclodecene (TBD) has a substantial impact on the reaction rate, the addition of lithium triflate (LiOTf) as a co-catalyst allows for the fastest ring opening reported in the current literature. Cooperative catalysis is also applied to the synthesis of polymers containing hydroxyurethane linkages and is able to achieve rapid conversion of the bis-cyclic carbonate and diamine precursors when compared with the uncatalyzed reaction.
