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