The mole ratio of {TAIL ~ compound} to compound may be in the range of 1:1 1:5, but preferably in the range of 1:1 1:1.5 with a view to maximizing the economy of {HEAD ~ the overall process} 
The mole ratio of { TAIL ~ compound } to compound may be in the range of 1:1 1:5 , but preferably in the range of 1:1 1:1.5 with a view to maximizing the economy of { HEAD ~ the overall process }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH 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 HEAD HEAD