Careful attention must be paid to step wherein the trimethylsilylating agent is added to the molten alcohol, catalyzed with {HEAD ~ the organic superacid}, to avoid {TAIL ~ an uncontrollable reaction} 
Careful attention must be paid to step wherein the trimethylsilylating agent is added to the molten alcohol , catalyzed with { HEAD ~ the organic superacid } , to avoid { TAIL ~ an uncontrollable reaction }
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 OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL