Catalytic Non-redox Carbon Dioxide Fixation in Cyclic Carbonates
作者:Saravanan Subramanian、Julius Oppenheim、Doyun Kim、Thien S. Nguyen、Wahyu M.H. Silo、Byoungkook Kim、William A. Goddard、Cafer T. Yavuz
DOI:10.1016/j.chempr.2019.10.009
日期:2019.12
selectivity for a range of substrates under ambient conditions and without the need for co-catalysts, metals, solvent, or pressure. COP-222 is recyclable and has been demonstrated to retain complete retention of activity for over 15 cycles. Moreover, it is scalable to at least a kilogram scale. We determined the reaction mechanism by using quantum mechanics (density functional theory), showing that it involves
catalysts of N‐iodopyridinium halide featured with N−I bond were synthesized and evaluated in CCE reactions. The optimal XBD catalyst, 4‐(dimethylamino)‐N‐iodopyridinium bromide ([DMAPI]Br), under screened conditions at 100 °C, ambient pressure, and 1 mol % catalyst loading, realized 93 % conversion of styrene oxide into cyclic carbonate in 6 h. The substratescope was successfully extended with excellent
与氢键平行的卤素键被引入到二氧化碳到环氧化物(CCE)反应的催化环加成中。合成了一系列具有N-1键的N-碘吡啶鎓卤化物的卤素键供体(XBD)催化剂,并在CCE反应中进行了评估。最佳XBD催化剂,4-(二甲氨基)-N-溴化碘吡啶鎓([DMAPI] Br),在100°C,环境压力和1 mol%催化剂负载的筛选条件下,实现了93%的氧化苯乙烯转化为环状碳酸酯在6小时内 底物范围成功扩大,并具有优异的收率(大多数≥93%)和定量选择性(超过99%)。1个底物环氧化物上的催化剂[DMAPI] Br的1 H NMR光谱证明,N-1键与环氧基直接配位。提出了一种可能的卤素键催化机理,其中DMAPI阳离子起卤素键供体的作用来激活环氧化物,而抗衡阴离子溴化物攻击亚甲基碳以引发环氧化物的开环。N-碘吡啶鎓卤化物促进的CCE反应是环氧活化和CO 2转化中卤素键催化的第一种情况。
CO<sub>2</sub>, COS and CS<sub>2</sub> adducts of N-heterocyclic olefins and their application as organocatalysts for carbon dioxide fixation
作者:Yan-Bo Wang、Dong-Sheng Sun、Hui Zhou、Wen-Zhen Zhang、Xiao-Bing Lu
DOI:10.1039/c5gc00948k
日期:——
Various CO2, COS and CS2 adducts of N-Heterocyclic olefin (NHO) were synthesized and characterised by single crystal X-ray crystallography. The length of C-O bond in NHO-COS adducts is slightly shorter...
A new 3D luminescent Ba-organic framework with high open metal sites: CO<sub>2</sub> fixation, luminescence sensing, and dye sorption
作者:Meng Wang、Jiao Liu、Jing Jin、Dan Wu、Guoping Yang、Wen-Yan Zhang、Yao-Yu Wang
DOI:10.1039/d0ce01604g
日期:——
A new 3D luminescent Ba-organic framework [Ba3L2(NMP)2(H2O)2]·2NMP·H2O}n (1) was first synthesized based on Ba(II) and a triangular-shaped bridging rigidligand, namely 1,3,5-tris(4-carboxyphenly)benzene (H3L), via solvothermal reaction (NMP = N-methyl pyrrolidone), thereby forming a stabilized network including a one-dimensional (1D) infinite rod-like helicalmetal chain. 1 may be explored as a recyclable