nano‐fibrillated mesoporous carbon (IFMC) was successfully prepared via carbonization of the ionicliquid 1‐methyl‐3‐phenethyl‐1H‐imidazolium hydrogen sulfate (1) in the presence of SBA‐15. The material was shown to be an efficient and unique support for the palladium nanoparticle (PdNP) catalyst Pd@IFMC (2) in aerobicoxidation of heterocyclic, benzylic, and heteroatom containing alcohols on pure water at temperatures
Base-free glucose dehydration catalysed by NHC-stabilised heterohalo cyclopentadienyl Cr(<scp>iii</scp>) complexes
作者:Frederick P. Malan、Eric Singleton、Petrus H. van Rooyen、Jeanet Conradie、Marilé Landman
DOI:10.1039/c8nj04804e
日期:——
detailed conformational DFT analysis, which showed metal-centred redox behaviour. Furthermore, the Cr(III) complex salt (6) was electrochemically oxidised to Cr(IV) and electrochemically reduced to Cr(II) more readily than the related Cr(III)–NHC complexes (1–5). All complexes (1–6) were active (up to 81% conversion) as catalysts in the dehydration of glucose to form 5-hydroxymethylfurfural in moderate
从发新世及其相应的咪唑鎓盐中合成了五种空气稳定的杂卤代Cr(III)-NHC配合物(1-5)。使用N -4-NO 2-苄基咪唑盐会导致副反应,发生C–N键断裂,形成咪唑Cr(III)络合物盐(6)。通过循环伏安法和详细的构象DFT分析研究了所有六个配合物的电化学过程,结果表明了以金属为中心的氧化还原行为。此外,将Cr(III)络合物盐(6)电化学氧化为Cr(IV),然后电化学还原为Cr(III)。II)比相关的Cr(III)-NHC配合物(1-5)更容易。所有复合物(1-6)都具有活性(转化率高达81%)作为葡萄糖脱水形成5-羟甲基糠醛的催化剂,产率中等(高达76%)。该均相体系不需要氧化剂或化学计量的强碱(例如KO t Bu),而这在相关的催化体系中通常是必需的,这对于开发使用天然丰富前体的绿色催化过程非常重要。
Precious metal N-heterocyclic carbene-carbaboranyl complexes: Cytotoxic and selective compounds for the treatment of cancer
作者:Rianne M. Lord、Jordan Holmes、Frances N. Singer、Abigail Frith、Charlotte E. Willans
DOI:10.1016/j.jorganchem.2019.121062
日期:2020.2
comparing the cytotoxicity towards normal cells. Overall, these complexes show significant selectivity for ovarian carcinoma, and are up to 3-fold more cytotoxic than cisplatin against cisplatin-resistant human ovarian carcinoma. Upon replacing the benzyl moiety of the NHC ligand with a carbaboranyl there is a general increase observed in the potency of the complexes, with the cytotoxicity of the ruthenium
Facile Suzuki-Miyaura coupling of activated aryl halides using new CpNiBr(NHC) complexes
作者:Frederick P. Malan、Eric Singleton、Petrus H. van Rooyen、Marilé Landman
DOI:10.1016/j.jorganchem.2016.03.017
日期:2016.7
subsequently followed with reaction of a secondary alkyl-, benzyl-, or phenylethyl halide. The series of [CpNiBr(NHC)] exhibited catalytic activity in the Suzuki-Miyaura coupling of activated aryl halides with phenylboronic acid to give the respective biphenyl and biphenyl-containing products. In general, the more electron-donating NHC-bearing Ni complexes showed higher activity with aryl halides bearing
由镍茂和相应的对称或不对称烷基/-苄基/苯乙基咪唑鎓溴化配体合成了九种新的Ni(II)-NHC络合物[CpNiBr(NHC)],产率较高。通过使咪唑去质子化,然后用烷基或芳基卤化物处理,随后使仲烷基-,苄基-,或苯基乙基卤化物。[CpNiBr(NHC)]系列在活化的芳基卤化物与苯基硼酸的Suzuki-Miyaura偶联中表现出催化活性,从而得到各自的含联苯和联苯的产物。一般来说,带有更多给电子体的带有NHC的Ni配合物显示出更高的活性,这些芳基卤化物带有带有吸电子功能的芳族卤化物,包括羧醛部分。所有复合物的特征是1 H和13 C NMR光谱,FT-IR光谱,CHN和MS分析以及此处报告的六种选定的单晶X射线结构。
Ionic Liquids on Demand in Continuous Flow
作者:Daniel Wilms、Johannes Klos、Andreas F. M. Kilbinger、Holger Löwe、Holger Frey
DOI:10.1021/op900069a
日期:2009.9.18
over the alkylation reactions due to a high surface-to-volume ratio and superior heat and mass transport. Within the scope of our studies, we focused on ionic liquids containing differently substituted phenyl rings and characterized these compounds with respect to further use for direct application or subsequent reactionsequences. Scale-up can conveniently be achieved by operating several reactors with