The diacetylenes are useful as {HEAD ~ monomers} for preparing {TAIL ~ fluorinated polyether elastomers} 
for preparing
The diacetylenes are useful as { HEAD ~ monomers } for preparing { TAIL ~ fluorinated polyether elastomers }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL