A catalyst precursor is provided that is useful in the selective hydrogenation of {HEAD ~ olefinic unsaturation} in {TAIL ~ polymers} or copolymers 
in
A catalyst precursor is provided that is useful in the selective hydrogenation of { HEAD ~ olefinic unsaturation } in { TAIL ~ polymers } or copolymers
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH