Reflux times less than 6 hours can result in lower than desirable {HEAD ~ A/B mole ratios} in {TAIL ~ the product powder} 
in
Reflux times less than 6 hours can result in lower than desirable { HEAD ~ A / B mole ratios } in { TAIL ~ the product powder }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL