This invention relates to a novel catalyst comprising a compound of {HEAD ~ 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 {TAIL ~ a specific structure} 
This invention relates to a novel catalyst comprising a compound of { HEAD ~ 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 { TAIL ~ a specific structure }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL