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