comprising contacting a 3,4 dialkoxythiophene with {HEAD ~ an ω halo 1,2 alkanediol} in {TAIL ~ the presence} of an acid 
comprising contacting a 3,4 dialkoxythiophene with { HEAD ~ an ω halo 1,2 alkanediol } in { TAIL ~ the presence } of an acid
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH