reacting the cellulose activate with an acetylating agent in {HEAD ~ the presence} of {TAIL ~ the acetylating catalyst} and acetylating solvent, 
of
reacting the cellulose activate with an acetylating agent in { HEAD ~ the presence } of { TAIL ~ the acetylating catalyst } and acetylating solvent ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH