Patent ID: 8703888

Claim:
A catalytic system comprising: (a) a precatalyst comprising: (i) a ruthenium metal, (ii) at least one multidentate Schiff base ligand comprising an imino group and being coordinated to the metal, in addition to the nitrogen atom of said imino group, through at least one further heteroatom selected from the group consisting of oxygen, sulphur and selenium ligated to said metal, (iii) a nucleophilic carbene ligand ligated to said metal, (iv) a carbon-containing ligand ligated to said metal, wherein said carbon-containing ligand is a substituted or unsubstituted alkylidene, vinylidene or indenylidene ligand, (v) optionally, an anionic ligand different from the Schiff base ligand (ii), (b) a precatalyst activator, and (c) an inhibitor, wherein the inhibitor is selected from the group consisting of phosphites having formula P(OR 1 )(OR 2 )(OR 3 ) where R 1 , R 2 , R 3 may be the same or different and are each selected from the group consisting of hydrogen, C 1 -C 20 alkyl, C 1 -C 20 heteroalkyl, C 1 -C 20 alkoxy and aryl optionally substituted with one or more moieties selected from the group consisting of C 1 -C 20 alkyl, C 1 -C 20 heteroalkyl, C 1 -C 20 alkoxy, aryl, aryloxy, heteroaryl, heterocycloalkyl, disulfide, carbonate, isocyanate, carbodiimide, carboalkoxy, carbamate, halogen, thioether, ketone, aldehyde, ester, ether, amine, amide, nitro and carboxylic acid, the non-hydrogen groups optionally substituted with one or more moieties selected from the group consisting of C 1 -C 20 alkyl, C 1 -C 20 alkoxy and aryl.