New catalyst system and its use for the metathesis reaction

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A new catalyst system comprising a metathesis catalyst and one or more salts of mono-, di- and/or tri-valent cations other than copper. A new catalyst system comprising a metathesis catalyst and one or more salts of formula K n+> A z-> (I), in which K : a cation other than copper; A : an anion; n, z : 1, 2 or 3 .