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 closing metathesis reactions (RCM) in the eco-friendly solvent DMC and their multiple-use was studied. (C) 2012 Elsevier B.V. All rights reserved.