Particularly, {HEAD ~ the carbonate}, thionocarbonate, and oxalate cyclic esters are prepared and used as {TAIL ~ monomers} or reactants to prepare useful products 
used as
Particularly , { HEAD ~ the carbonate } , thionocarbonate , and oxalate cyclic esters are prepared and used as { TAIL ~ monomers } or reactants to prepare useful products
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH