The monoanionic osmium catalyst also exhibits {HEAD ~ an increased selectivity} toward {TAIL ~ the straight chain product} 
toward
The monoanionic osmium catalyst also exhibits { HEAD ~ an increased selectivity } toward { TAIL ~ the straight chain product }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL