<i>N</i>-Heterocyclic Carbene Coordinated Heterogeneous Pd Nanoparticles as Catalysts for Suzuki–Miyaura Coupling
作者:Hyemin Min、Hiroyuki Miyamura、Shū Kobayashi
DOI:10.1246/cl.160369
日期:2016.7.5
Palladium nanoparticle (Pd NP) catalysts immobilized in a polymer with an N-heterocycliccarbene (NHC) moiety (PICB-NHC-Pd) have been developed, wherein the NHC moiety plays dual roles as a crosslinker and a ligand to activate the Pd NPs. The presence of both Pd NPs and NHC was confirmed by STEM/EDS and SR-MAS NMR analyses, respectively. This PICB-NHC-Pd catalyst showed excellent activity in the Suzuki–Miyaura
Chemical Tuning of Zwitterionic Ionic Liquids for Variable Thermophysical Behaviours, Nanostructured Aggregates and Dual-Stimuli Responsiveness
作者:Yajnaseni Biswas、Pratyush Ghosh、Tarun K. Mandal
DOI:10.1002/chem.201802367
日期:2018.9.6
varying spacer length produces the ZILs. In aqueous solution, a ZIL molecule either exist in its ionicliquid (substituted imidazolium bromide) form or its zwitterionic (substituted imidazolium alkyl carboxylate) form with an isoelectric point (pI) depending on the pH value of the solution. Upon changing the pH to near or above the pI, the aqueous ZIL solution undergoes transition from a transparent to a
Mesoporouspoly(ionic liquid)s (MPILs) are promising candidates for CO2 capture and CO2conversion; however, no quaternary ammonium-based MPIL has been reported for cycloaddition of CO2 to epoxides. Herein, a series of novel sponge-like crosslinked quaternary ammonium-based MPILs containing rich exposed anions and a large surface area were successfully prepared by free-radical polymerization and subsequent
Ionic liquid containing electron-rich, porous polyphosphazene nanoreactors catalyze the transformation of CO<sub>2</sub> to carbonates
作者:Zhangjun Huang、Jorge G. Uranga、Shiliu Zhou、Haiyan Jia、Zhaofu Fei、Yefeng Wang、Felix D. Bobbink、Qinghua Lu、Paul J. Dyson
DOI:10.1039/c8ta08856j
日期:——
simultaneously capture and transform CO2 into carbonates. The PPZ nanospheres swell in organic solvents and effectively absorb IL cations by virtue of the electron-rich sites, while leaving the anions exposed and increasing their nucleophilicity. This leads to considerably higher catalytic activity compared to the IL alone in the cycloaddition reaction of CO2 to epoxides. The cation shielding effect
Functionalized Ionic (Poly)Styrenes and their Application as Catalysts in the Cycloaddition of CO<sub>2</sub>to Epoxides
作者:Felix D. Bobbink、Zhaofu Fei、Rosario Scopelliti、Shoubhik Das、Paul J. Dyson
DOI:10.1002/hlca.201600112
日期:2016.11
interest. In this context, a key reaction is the cycloaddition of CO2 to epoxides to form carbonates (CCE). A series of organocatalysts for this reaction, based on imidazolium salts modified with a styrene functional group and a second variable functional group, were prepared and characterized. Both the ionic salts and ionic polymers derivedfrom the salts were evaluated in this reaction. In general, the