Microwave-Assisted Synthesis of Tris-Anderson Polyoxometalates for Facile CO<sub>2</sub> Cycloaddition
作者:Wei-Dong Yu、Yin Zhang、Yu-Yang Han、Bin Li、Sai Shao、Le-Ping Zhang、Hong-Ke Xie、Jun Yan
DOI:10.1021/acs.inorgchem.1c00019
日期:2021.3.15
(NH4)4[ZnMo6O18(C4H8NO3)(OH)3]·4H2O (1), (NH4)4[CuMo6O18(C4H8NO3)(OH)3]·4H2O (2), (TBA)3(NH4)[ZnMo6O17(C5H9O3)2(OH)]·10H2O (3) (TBA = n-C16H36N), and (NH4)4[CuMo6O18(C5H9O3)2]·16H2O (4), were synthesized by a microwave-assisted method. Single-crystal X-ray diffraction revealed that 1 and 2 contained a tris (trihydroxyl organic compounds) ligand grafted on one side, while two tris ligands were grafted on two sides to
四个新的tris-Anderson多金属氧酸盐(POMs)(NH 4)4 [ZnMo 6 O 18(C 4 H 8 NO 3)(OH)3 ]·4H 2 O(1),(NH 4)4 [CuMo 6 O 18(C 4 H 8 NO 3)(OH)3 ]·4H 2 O(2),(TBA)3(NH 4)[ZnMo 6 O 17(C 5 H 9 O 3)2(OH)]·10H 2 O(3)(TBA = n -C 16 H 36 N)和(NH 4)4 [CuMo 6 O 18(C 5 H 9 O 3)2 ]·16H 2 O (4)是通过微波辅助法合成的。X射线单晶衍射表明,1和2的一侧接有一个tris(三羟基有机化合物)配体,而两侧的两个tris配体接枝了,在3和3中形成χ/δ和δ/δ异构体。分别为4。首次获得χ/δ异构体3的1 H和13 C NMR光谱,其中6个亚甲基在1 H NMR光谱中显示6个峰,在13
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。
Versatile and scalable synthesis of cyclic organic carbonates under organocatalytic continuous flow conditions
作者:Romaric Gérardy、Julien Estager、Patricia Luis、Damien P. Debecker、Jean-Christophe M. Monbaliu
DOI:10.1039/c9cy01659g
日期:——
epoxides. In this work, cyclic organic carbonates are prepared according to alternative sustainable and intensified continuousflow conditions from the corresponding 1,2-diols. The process utilizes dimethyl carbonate (DMC) as a low toxicity carbonation reagent and relies on the organocatalytic activity of widely available and cheap organic ammonium and phosphonium salts. Glycerol is selected as a model