Cyclic amidine hydroiodide for the synthesis of cyclic carbonates and cyclic dithiocarbonates from carbon dioxide or carbon disulfide under mild conditions
作者:Naoto Aoyagi、Yoshio Furusho、Takeshi Endo
DOI:10.1016/j.tet.2019.130781
日期:2019.12
Hydroiodides of amidines can catalyze the reaction of carbon dioxide and epoxides under mild conditions such as ordinary pressure and ambient temperature, and the corresponding five-membered cyclic carbonates were obtained in high yields. The reaction of epoxide with carbon disulfide was also examined under the same conditions. Detailed investigation showed that the catalytic activity was highly affected
Efficient chemical fixation of CO<sub>2</sub> from direct air under environment-friendly co-catalyst and solvent-free ambient conditions
作者:Rajesh Das、Thirumavalavan Ezhil、Athulya S. Palakkal、D. Muthukumar、Renjith S. Pillai、C. M. Nagaraja
DOI:10.1039/d1ta05138e
日期:——
products undermildconditions represents a promising step towards environmental remediation and energy sustainability. Consequently, herein, we report the first example of a Mg(II)-based MOF exhibiting highlyefficientfixation of CO2 from direct air into value-added cyclic carbonates under eco-friendly co-catalyst and solvent-free mildconditions. The bifunctional MOF catalyst was rationally constructed
在温和条件下从直接空气中捕获 CO 2并将其转化为增值产品代表了朝着环境修复和能源可持续性迈出的有希望的一步。因此,在本文中,我们报告了基于Mg( II ) 的 MOF的第一个实例,该实例在生态友好的助催化剂和无溶剂温和条件下,将直接空气中的 CO 2高效固定为具有附加值的环状碳酸酯。双功能 MOF 催化剂是通过利用生态友好的路易斯酸性金属离子 Mg( II ) 和富氮三足连接体 TATAB 合理构建的。MOF 具有 2606.13 m 2 g -1的高 BET 表面积以及用高密度的亲CO 2位点装饰的高极性一维通道,其在273 K 下促进了50.2 wt%的显着高CO 2吸收,具有55.13 kJ mol -1的高吸附热值。高 CO 2亲和力与高密度亲核和路易斯酸性位点的存在相结合,赋予 Mg-MOF 有效的催化性能,用于在环境友好的温和条件下从直接空气中化学固定 CO 2。Mg-MOF
Zn(<scp>ii</scp>) assisted synthesis of porous salen as an efficient heterogeneous scaffold for capture and conversion of CO<sub>2</sub>
作者:Subhajit Bhunia、Rostam Ali Molla、Vandana Kumari、Sk. Manirul Islam、Asim Bhaumik
DOI:10.1039/c5cc06868a
日期:——
A new zinc-salen functionalized porous polymer has been synthesized by an easy one-step process, which shows unprecedented catalytic efficiency in the CO2 fixation reaction via cycloaddition of CO2 with epoxides.
METHOD FOR PREPARING A COMPOUND COMPRISING AT LEAST ONE BETA-HYDROXY-URETHANE UNIT AND/OR AT LEAST ONE UPSILON-HYDROXY-URETHANE UNIT
申请人:Soules Aurélien
公开号:US20140378648A1
公开(公告)日:2014-12-25
The invention relates to a method for preparing a compound comprising at least one β-hydroxy-urethane unit and/or at least one γ-hydroxy-urethane unit, consisting in reacting a compound (A) comprising at least one cyclocarbonate reactive unit with a compound (B) comprising at least one amino reactive unit (—NH2) in the presence of a catalyst. The invention also relates to the use of a catalyst comprising at least one organometallic complex and a co-catalyst chosen from the group of Lewis bases and/or tetra-alkyl ammonium salts, in order to catalyse the method of the invention. The invention relates to the technical field of preparing urethane derivatives.
Zinc Complexes with Tridentate Pyridyl‐Pyrrole Ligands and their Use as Catalysts in CO
<sub>2</sub>
Fixation into Cyclic Carbonates
作者:Jing‐Jing Chen、Yao‐Chun Xu、Zhi‐Liang Gan、Xiao Peng、Xiao‐Yi Yi
DOI:10.1002/ejic.201801246
日期:2019.4.9
are interesting due to their rich coordination chemistry and their use in molecular devices, biological therapeutics, and catalytic transformations. Cs‐symmetric HL3 ligand Br‐substituted on one of the pyridyl rings was designed and synthesized by Paal–Knorr pyrrole condensation. Ligand HL4 was synthesized by Suzuki‐coupling reaction between HL3 and 2‐thiopheneboronic acid in the presence of K2CO3 and
吡啶基吡咯配体通常模仿聚吡啶配体,它们的金属配合物非常有趣,这是因为它们具有丰富的配位化学以及在分子装置,生物治疗和催化转化中的用途。Ç小号-对称ħ大号3配体的吡啶基环中的一个溴取代的设计并通过帕尔-克诺尔吡咯缩合合成。配体H L 4是在脱气的THF / H 2 O溶液中,在K 2 CO 3和Pd(PPh 3)4存在下,通过H L 3和2-噻吩硼酸之间的Suzuki偶联反应合成的。锌络合物1 - 5用H大号1至H大号5是通过用在二乙基锌的甲苯相应的吡啶基吡咯配体的在0℃下以高产率制备。X射线衍射分析表征了配体H L 3和所有锌配合物。游离HL 3的结构是平面的。在Zn的几何形状1,2,和5被压缩八面体,而在3和4,他们也许最好地描述为之间是顺-divacant八面体和扭曲的四面体。在这些锌络合物中,较短的Zn–N吡咯[1.878(5)-1.950(4)Å]和更长的Zn-N吡啶[2.108(5)-2