Hoveyda-type complexes have been synthesised and fully characterised. Their ability to suppress undesired double-bond migration along the carbon chain during metathesis reactions was examined. It was proved that these catalysts decrease the amounts of undesired side-products with a shifted doublebond in the reaction mixture.
Batchwise and Continuous Nanofiltration of POSS-Tagged Grubbs-Hoveyda-Type Olefin Metathesis Catalysts
作者:Anna Kajetanowicz、Justyna Czaban、G. Rajesh Krishnan、Maura Malińska、Krzysztof Woźniak、Humera Siddique、Ludmila G. Peeva、Andrew G. Livingston、Karol Grela
DOI:10.1002/cssc.201200466
日期:2013.1
New molecular‐weight‐enlarged metathesiscatalysts, which bear polyhedral oligomeric silsesquioxane (POSS) tags, were synthesized and characterized. The catalysts can be recovered from the reaction mixture by using nanofiltration techniques and can be reused. It was found that the membranes Starmem 228 and PuraMem 280 successfully separate the catalyst from the post‐reaction mixtures to below 3 ppm
Ruthenium catalysts bearing chelating carboxylate ligands: application to metathesis reactions in water
作者:Rafał Gawin、Patrycja Czarnecka、Karol Grela
DOI:10.1016/j.tet.2009.11.009
日期:2010.1
The novel catalytic system, composed of a ruthenium alkylidene containing a surfactant fragment in the catalysts molecule, is reported. Ring closing metathesis and cross metathesis reactions proceed efficiently in neat water at room temperature, in air, without need of adding an external surfactant.
complexe containing macrocyclic N-heterocyclic carbene ligand with two small aryl arms tied together was obtained and characterised. Interestingly, it can exist in two forms, cis and trans. Both of them exhibit similarly high thermodynamic stability, yet different application profiles in catalysis, however both can be used in difficult metathesis reactions, also leading to the formation of tetrasubstituted