Metathesis under Biphasic Conditions Using Monolithic-Supported Ionic Liquids
Zusammenfassung der Projektergebnisse
• Synthesis of porous polymeric monolithic supports. Both ROMP and EB-triggered free radical polymerization-derived supports shall be prepared. • Surface-functionalization of these supports with either quaternary ammonium, imidazolium or phosphonium-based monomers containing different anions, e.g., bis(trifluoromethylsulfon)imide, hexafluorophosphate, tetrafluoroborate, trifluoromethanesulfonate or trifluoroacetate as well as with low amounts of 2-propoxystyryl ethers for the stabilization of intermediary formed metal methylidenes. Electron beam- (EB) triggered free radical polymerization, post-synthesis grafting as well as ROMP-based protocols shall be applied. • Immobilization of a series of ammonium, imidazolium or phosphonium based ILs on different grafted monolith surfaces. • Synthesis and immobilization of novel Schrock- and Grubbs-Hoveyda metathesis catalysts bearing ionic moieties within the monolith-supported ILs and use of the thus prepared supported metathesis catalysts in various CM, RCM, ROC and ene-yne (cross) metathesis reactions on a larger scale applying a continuous flow set-up. Solvents immiscible with the IL shall be used. While both the reactants and the products shall be soluble in both the IL and the organic solvent, the catalysts are designed in a way that they are only soluble in the corresponding IL. • Evaluation of selected metathesis reactions in terms of reaction kinetics (TOF), activity (TON), catalyst selectivity and longevity, product purity (metal content) and recycling of the support.
