Abstract A dicationic ruthenium–alkylidene complex [Ru (dmf) 3 (IMesH 2)([DOUBLE BOND] CH-2-(2-PrO)-C 6 H 4)][(BF 4) 2](1; IMesH 2= 1, 3-dimesitylimidazolin-2-ylidene) has been prepared and used in continuous metathesis reactions by exploiting supported ionic-liquid phase (SILP) technology. For these purposes, ring-opening metathesis polymerization (ROMP)-derived monoliths were prepared from norborn-2-ene, tris (norborn-5-ene-2- ...