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 {HEAD ~ a conjugated diene polymer} using the catalyst, and {TAIL ~ polybutadiene} having a specific structure 
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 { HEAD ~ a conjugated diene polymer } using the catalyst , and { TAIL ~ polybutadiene } having a specific structure
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH