Used as a catalyst precursor in organic synthesis, particularly in reactions involving olefin metathesis. Its structure allows for the formation of active metal-carbene species, which facilitate the rearrangement of carbon-carbon double bonds. Commonly applied in ring-closing metathesis to form cyclic compounds and in cross-metathesis for the coupling of two different alkenes. Also employed in polymer chemistry for the synthesis of advanced materials with tailored properties. The presence of chloro ligands enables ligand exchange, making it adaptable for various catalytic systems. Effective in low concentrations and often used under inert atmosphere due to air and moisture sensitivity.