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Supported Ionic Liquids and Ionic Catalysts for Continuous Biphasic Reactions

We are designing and synthesizing novel ionic Grubbs-type and Schrock-type catalysts for biphasic metathesis reactions. These specialized catalysts contain ion-containing ligands and are immobilized in a supported ionic liquid phase (SILP) on monolithic columns for the preparation of catalyst-free metathesis products in a continuous process [1]. While the products are eluted, the ion-containing catalysts remain in the ionic liquid phase. Recycling of the columns is facile and requires simple removal of ionic liquid and dissolved catalyst with solvent.
Future projects involve the synthesis of various Grubbs-type and Schrock-type catalysts with ion-containing ligands and the evaluation of their catalytic activity in biphasic, continuous reactions. The study of the type and the placement of the ionic group as they affect coordination to different substrates and catalytic activity under various conditions will be evaluated.

Figure 1. A biphasic continuous metathesis reaction using a cationic catalyst dissolved in ionic liquids immobilized on the surface of a monolith

Figure 1. A biphasic continuous metathesis reaction using a cationic catalyst dissolved in ionic liquids immobilized on the surface of a monolith

Figure 2. Structure of an ionic Ru-alkylidene complex used for metathesis reactions under SILP conditions [1].