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