The process comprises adding {HEAD ~ an olefin} to {TAIL ~ a titanium halide} and then adding an electron donor to the mixture of the olefin and titanium halide 
to
The process comprises adding { HEAD ~ an olefin } to { TAIL ~ a titanium halide } and then adding an electron donor to the mixture of the olefin and titanium halide
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH