Butadiene late transition metals

Mixtures of Ni and Co salts with organoaluminum reagents catalyze the polymerization of 1,3-butadiene, whereas these catalysts are not effective for alkene polymerization due to facile chain transfer by /1-hydrogen elimination of the growing polymer. The polymerization of 1,3-butadiene usually proceeds via the intermediate n-allyl complexes, which are more stable than the alkyl metal complexes and hardly cause any /1-hydrogen elimination [56]. The late transition metal compounds polymerize 1,3-butadiene even in... 

Late-transition metal (Ni, Pd, Fe, and Co) olefin polymerization catalysts are particularly stable to Lewis bases and water in contrast to the vast majority of olefin polymerization catalysts. Miilhaupt et al. used both Pd- and Ni-based catalysts, [ iPr2C6H3N=C(Me)C(Me)=NC6H3iPr2-2,6 Pd(CH3)(N=CCH3)]dBArJ- and N,N-bis(2,6-diisopropylphenyl)- , 4-diaza-2,3-dimethyl-l,3-butadiene nickel dibromide, for preparing highly branched PE-clay nanocomposite. They found that they were much less sensitive to the addition of non-modified and modified layered silicates than metallocene catalysts. 

After that, studies on the palladium-catalyzed reactions of conjugated dienes attracted little attention. They have only been reexamined since the late 1960 s. The scope of the reaction of butadiene catalyzed by palladium complexes has gradually been established. The catalysis by palladium is different from those of other transition metals. Although palladium is located below nickel in the periodic table, the catalytic... 

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