Catalyst systems comprising an alkaline earth metal chloride and their application for metathesis reactions

摘要

Catalyst system (I) comprising a metathesis catalyst containing a complex catalyst on basis of a 6th or 8th group metals and exhibits at least one carbene group at the metal bonded ligands, and an alkaline earth metal chloride, preferably calcium chloride or magnesium chloride, is new. An independent claim is included for the molecular weight degradation of the nitrile rubber, where co- or ter-polymer containing at least a conjugated diene, at least an alpha ,beta -unsaturated nitrile and optionally one or more further copolymerizable monomer is used as nitrile rubber, comprising contacting the nitrile rubber with (I) optionally in the presence of a co-olefin.