Typically, {HEAD ~ the molar ratio} of alkene to {TAIL ~ feed material} is less than about 3.0/1.0, preferably less than about 2.0/1.0 
Typically , { HEAD ~ the molar ratio } of alkene to { TAIL ~ feed material } is less than about 3.0/1.0 , preferably less than about 2.0/1.0
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH