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