The Grubbs-type 1 and Hoveyda–Grubbs-type 2 catalysts are the most widely used catalysts in ring-closure metathesis (RCM). They are extraordinarily versatile to tolerate a variety of functional groups in the alkenes and are compatible with a wide range of solvents. Despite these advantages, the separation of the soluble catalyst from the product and any reaction solvent remains difficult. Current effort 3 toward solving the problem is focused on anchoring ...