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In the course of cis copolymerization of butadiene(BD) with isoprene(IP) by using Nd(naph) 3 Al(C 2H 5) 3 ( t C 4H 9)Cl as catalyst in toluene, tert butylchloride or allyl chloride was added to give a soluble, gel free cyclized copolymer.

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