Palladium-poly(ionic liquid) membranes for permselective sonochemical flow catalysis

Anisotropic palladium-poly(ionic liquid) catalyst membranes have been prepared by complexation of palladium (II) chloride to poly(ionic liquid) functionalised flexible porous substrates. The practical viability of these low loading (sub 0.1 mol%) palladium catalyst membranes for continuous flow reactions at ambient temperature is demonstrated for the Suzuki-Miyaura carbon-carbon coupling reaction by contacting the reactant mixture with the catalyst membrane and applying sonication. The Suzuki-Miyaura carbon-carbon coupling reaction proceeds at the palladium-poly(ionic liquid) catalyst membrane surface in conjunction with selective permeation (separation) of the desired product species through the underlying porous support. These palladium-poly(ionic liquid) catalyst membranes display minimal metal leaching enabling them to be reused multiple times.