This reduces the amount of water initially in the reaction mixture and provides {HEAD ~ a shorter reaction time} by preventing {TAIL ~ the establishment} of an unfavorable equilibrium 
by preventing
This reduces the amount of water initially in the reaction mixture and provides { HEAD ~ a shorter reaction time } by preventing { TAIL ~ the establishment } of an unfavorable equilibrium
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH