Which of the following catalyst is used to obtain polybutadiene of cis content <40%?

Which of the following catalyst is used to obtain polybutadiene of cis content <40%? Correct Answer butyl lithium catalyst

When polybutadiene is prepared using butyl lithium catalyst, rubber of lower cis content (<40%) is formed. Using coordination catalyst, high cis content (>90%) polybutadiene is obtained.
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