Noncovalent Immobilization of Cationic Ruthenium Complex in a Metal–Organic Framework by Ion Exchange Leading to a Heterogeneous Olefin Metathesis Catalyst for Use in Green Solvents
A simple strategy for noncovalentimmobilization of an olefin metathesiscatalyst inside a (Cr)MIL-101-SO3Na metal–organic framework (MOF) was presented. The olefin metathesis active core—an alkylidene complex bearing an ammonium-tagged NHC ligand (Apeiron’s FixCat)—was immobilized by ion exchange facilitated by the use of crown ether. The hybrid material thus obtained was shown with a number of model
Synthesis of functionalised N-heterocyclic carbene ligands bearing a long spacer and their use in olefin metathesis
作者:Wioletta Kośnik、Karol Grela
DOI:10.1039/c3dt33010a
日期:——
ligand precursors has been developed. These tagged NHC ligands can be used to obtain a homogeneous Hoveyda-type catalyst (19) containing a quaternaryammonium group on a C-8 long spacer. Products of olefinmetathesis reactions promoted by complex 19 can be readily purified from Ru-residues by filtration of the reaction mixture through a small amount of silica gel.
Ethyl Lactate: A Green Solvent for Olefin Metathesis
作者:Sebastian Planer、Anupam Jana、Karol Grela
DOI:10.1002/cssc.201901735
日期:2019.10.21
with ethyl lactate as solvent was evaluated using a range of substrates and conditions. In addition, the preparation of a metathesis catalyst in simplified manner by using the advantages of ethyl lactate was accomplished. The application of ethyl lactate facilitates product isolation (also allowing for lower ruthenium contamination in crude metathesis products) and improves the overall green angle
set of olefinmetathesis catalysts bearing a ruthenium amide moiety was synthesised. In the ruthenium amide form these complexes exhibit very low activity in standard metathesis reactions. However, a dramatic increase of activity was observed upon in situ activation with trimethylsilyl chloride or HCl, allowing successful application of such catalysts in a number of model ring‐closing metathesis, cross‐metathesis
Sulfoxide-Chelated Ruthenium Benzylidene Catalyst: a Synthetic Study on the Utility of Olefin Metathesis
作者:Karolina Żukowska、Łukasz Pączek、Karol Grela
DOI:10.1002/cctc.201600538
日期:2016.9.7
We provide an experimental summary of selected advances in olefin metathesis methodology that were reported over the past decades. A stable and universal sulfoxide‐chelated ruthenium olefin metathesis catalyst [RuCl2(SIMes)(=CH−C6H4−S(O)Ph)], SIMes=1,3‐bis(2,4,6‐trimethylphenyl)‐4,5‐dihydroimidazol‐2‐ylidene, was introduced and its application profile was studied in detail. A range of model substrates
我们提供了在过去几十年中报道的烯烃复分解方法的部分进展的实验总结。稳定且通用的亚砜螯合钌烯烃复分解催化剂[RuCl 2(SIMes)(= CH-C 6 H 4-S(O)Ph)],介绍了SIMes = 1,3-双(2,4,6-三甲基苯基)-4,5-二氢咪唑-2-亚基,并详细研究了其应用概况。已开发出一系列天然来源的模型底物,并成功地通过反应的变体进行了复分解,例如烯-炔,交叉或闭环复分解。报告的所有反应均在未经预处理的溶剂和空气中进行,以证明系统的用户友好性。除了已报道的配合物表现出的强大的官能团耐受性外,还确定了其与多种溶剂的相容性以及其空气和湿气的稳定性。另外,如果在约溶剂沸点的温度下进行反应,则观察到提高反应效率的有趣效果。