This invention relates to a novel catalyst comprising a compound of a transition metal of the group V of the Periodic Table, a process for producing a conjugated diene polymer using the catalyst, and {HEAD ~ polybutadiene} having {TAIL ~ a specific structure} 
having
This invention relates to a novel catalyst comprising a compound of a transition metal of the group V of the Periodic Table , a process for producing a conjugated diene polymer using the catalyst , and { HEAD ~ polybutadiene } having { TAIL ~ a specific structure }
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