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