This study is aimed at designing and synthesising new olefin metathesis catalysts grafted onto porous solid supports and using them in dimethyl carbonate (DMC) an eco-friendly solvent. Two hybrid organic–inorganic Hoveyda-type catalysts were prepared in a few steps by initial grafting of a tailor-made ligand by sol–gel process onto porous silica and zirconia. The new hybrid organic–inorganic catalysts were then engaged in a series of model ring ...