b synthesizing 1 1 u2032 2 5 dihexyl 1 4 phenylene bis thiourea from 2 5 dihyxylbenzene 1 4 diamine c synthesizing 4 8 dihexylbenzo 1 2 d 4 5 d u2032 bis thiazole 2 6 diamine from 1 1 u2032 2 5 dihexyl 1 4 phenylene bis thiourea and d synthesizing 2 6 dibromo 4 8 dihexylbenzo 1 2 d 4 5 d u2032 bis thiazole from 4 8 dihexylbenzo 1 2 d 4 5 d u2032 bis thiazole 2 6 diamine the following examples of certain embodiments of the invention are given each example is provided by way of explanation of the invention one of many embodiments of the invention and the following examples should not be read to limit or define the scope of the invention a toluene 400 ml solution of benzophenoeimine 18 1 g 100 mmol 1 4 dibromohexyl benzene 20 g 50 mmol t buona 10 g and dppf 2 pdcl 2 2 g was refluxed under argon the mixture was refluxed for 72 hours and then cooled to room temperature water 70 ml and aqueous hcl 37 70 ml were added to the mixture which was then refluxed for 10 hours and cooled to room temperature the solvent was removed by rotary evaporator the solid was stirred with ethyl ether 300 ml for 2 days then filtered washed with.