Diorganomagnesium compound for a catalytic system

Abstract

The invention relates to a diorganomagnesium compound of formula RB—Mg—RA, RA being different from R8, RA being a polymer chain containing units of a monomer chosen from the group of monomers consisting of 1,3-dienes, aromatic α-monoolefins and mixtures thereof, RB comprising a benzene nucleus substituted with a magnesium atom, one of the carbon atoms of the benzene nucleus ortho to the magnesium being substituted with a methyl, an ethyl, an isopropyl or forming a ring with the carbon atom which is its closest neighbour and which is meta to the magnesium, the other carbon atom of the benzene nucleus ortho to the magnesium being substituted with a methyl, an ethyl or an isopropyl, on condition that if one of the two ortho carbon atoms is substituted with an isopropyl, the second ortho carbon atom is not substituted with an isopropyl.

Dependencies are inferred from the claim text.