A catalyst obtained by contacting a compound of a transition metal of the group V of {HEAD ~ the Periodic Table} represented by {TAIL ~ formula} : 
A catalyst obtained by contacting a compound of a transition metal of the group V of { HEAD ~ the Periodic Table } represented by { TAIL ~ formula } :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL OTH