Application Umicore Grubbs Catalyst M203 is a homogeneous catalyst useful for alkene metathesis, especially for cross-metathesis, ring-closing metathesis and self-metathesis. Storage and stability Do not store above 25°C (77°F). Store in a tightly closed original container under dry inert gas, protected from direct sunlight in a dry, cool and well-ventilated area Product class M-P, Homogeneous Catalysts, N-Heterocyclic Carbene Ligands, M-C, Grubbs Catalyst® 2nd Generation, Carbene Ligands, IMes, Phosphorus Ligands - Achiral Reaction type Alkene Metathesis, Cross Metathesis, Ring Closing Metathesis, Self Metathesis Chemical properties Chemical formula C 54 H 67 Cl 2 N 2 PRu Empirical formula (IMes)Ru(PCy 3 )(Ind)Cl 2 Molecular weight 947.07 Metal Ru Theoretical metal content 11 Physical state powder Color Metal purity brown 99.95