With ethylene, for example, a significantly higher molar ratio can be used, because the self metathesis of {HEAD ~ ethylene} produces {TAIL ~ only ethylene} again; no undesirable co product olefins are formed 
With ethylene , for example , a significantly higher molar ratio can be used , because the self metathesis of { HEAD ~ ethylene } produces { TAIL ~ only ethylene } again ; no undesirable co product olefins are formed
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH