可以通过加热初步的双核加合物或通过直接加热2当量的配体配体来获得新的双金属螺旋铝配合物。的AlR 3。X射线衍射分析证实了配体中的高配位通用性和配合物中存在螺旋手性。DFT计算证实了双金属配合物中辅助蝎子的优先排列,并合理化了所提出的反应机理。研究了双金属配合物作为催化剂与卤化物结合用于CO 2的环加成反应与多种环氧化物形成环状碳酸酯。这些研究导致了可持续,廉价,高效和选择性的双组分系统的开发,该系统具有非常广泛的底物范围,包括内部的和具有挑战性的生物基三取代萜烯衍生的底物,在温和条件下可实现高反式环氧丙烷的转化率(79%转化温度为70°C,10 bar CO 2,1 mol%,66 h)
Chiral ionic liquids improved the asymmetric cycloaddition of CO2 to epoxides
作者:Suling Zhang、Yongzhong Huang、Huanwang Jing、Weixuan Yao、Peng Yan
DOI:10.1039/b821513h
日期:——
The new catalyst system of chiral SalenCo(OAc)/chiral ionic liquid was developed to catalyze the asymmetric cycloaddition reaction of CO2 and epoxides yielding the chiral cyclic carbonates. The synergistic effect between them is discussed.
A series of novel chiral metal-containing ionic liquids (CMILs) consisting of the cation of crown ether-chelated potassium/sodium and the anion of chiral amino acids were designed and synthesized. These new CMILs were used to catalyze the enantioselective cycloaddition of epoxides and carbon dioxide incorporating with the salenCo(OOCCCl3) to generate corresponding chiral cyclic carbonates under mild conditions. These new catalysts can be recycled at least five times without significant loss of activity and enantioselectivity.
Bifunctional Aluminum Catalyst for CO<sub>2</sub> Fixation: Regioselective Ring Opening of Three-Membered Heterocyclic Compounds
作者:Wei-Min Ren、Ye Liu、Xiao-Bing Lu
DOI:10.1021/jo501926p
日期:2014.10.17
Regioselective ring opening of three-membered heterocyclic compounds (epoxides or N-substituted aziridines) at various temperatures was observed in coupling reactions with CO2 by the use of an aluminum–salen catalyst in conjunction with intramolecular quaternary ammonium salts as cocatalysts, affording the corresponding five-membered cyclic products with complete configuration retention at the methine
Salen(Co(<scp>iii</scp>)) imprisoned within pores of a metal–organic framework by post-synthetic modification and its asymmetric catalysis for CO<sub>2</sub> fixation at room temperature
has been demonstrated. By adsorption and then post-synthetically modified (PSM) procedures, chiral salen(Co(III)) could be imprisoned within the cages of an MOF and remained in its free form. This is the first report on the successful application of CMOFs in heterogeneous asymmetric catalysis for coupling CO2 with epoxides to obtain optically active cyclic carbonates at room temperature.
Bimetallic scorpionate-based helical organoaluminum complexes for efficient carbon dioxide fixation into a variety of cyclic carbonates
作者:Marta Navarro、Luis F. Sánchez-Barba、Andrés Garcés、Juan Fernández-Baeza、Israel Fernández、Agustín Lara-Sánchez、Ana M. Rodríguez
DOI:10.1039/d0cy00593b
日期:——
preferential arrangement of the ancillary scorpionates in the bimetallic complexes and rationalized the proposed reaction mechanism. Bimetallic complexes were investigated as catalysts in combination with halides for the cycloaddition reaction of CO2 with a wide range of epoxides for cyclic carbonate formation. These studies led to the development of a sustainable, inexpensive, efficient and selective bicomponent
可以通过加热初步的双核加合物或通过直接加热2当量的配体配体来获得新的双金属螺旋铝配合物。的AlR 3。X射线衍射分析证实了配体中的高配位通用性和配合物中存在螺旋手性。DFT计算证实了双金属配合物中辅助蝎子的优先排列,并合理化了所提出的反应机理。研究了双金属配合物作为催化剂与卤化物结合用于CO 2的环加成反应与多种环氧化物形成环状碳酸酯。这些研究导致了可持续,廉价,高效和选择性的双组分系统的开发,该系统具有非常广泛的底物范围,包括内部的和具有挑战性的生物基三取代萜烯衍生的底物,在温和条件下可实现高反式环氧丙烷的转化率(79%转化温度为70°C,10 bar CO 2,1 mol%,66 h)