TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: 2,5-Dibromo-1,4-diiodobenzene (a), palladium catalyst (x), cuprous chloride, 3-bromo-trimethyltin-thiophene (b) are reacted in a reaction solvent, stirred at room temperature for 1-2 hours, heated at 50-55 degrees C for 3-4 hours, cooled to room temperature and reaction mixture is filtered, to obtain crude 2,2'-(2,5-dibromo-1,4-phenylene)bis(3-bromothiophene) (c). 2,2'-(2,5-Dibromo-1,4-phenylene)bis(3-bromothiophene) (c), sodium tert-butoxide, 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl compound, alkylamine and palladium catalyst (y) are dissolved in a solvent, stirred for 2-3 hours, cooled to room temperature, and reaction solution is filtered to remove solids. The filtrate is extracted, organic phase is washed with water, dried, filtered, organic solvent is evaporated, and purified by silica gel column chromatography, to obtain N-alkylated pyrrole-indole-thiophene derivative (d). The N-alkylated pyrrole-indole-thiophene derivative (d) is dissolved in tetrahydrofuran or N,N-dimethylformamide, cooled to -78 degrees C and N-bromosuccinimide is added, reacted for 0.5-12 hours, quenched with water, dried and purified, to obtain compound (II). Preferred Composition: The catalyst is tetrakis(triphenylphosphine)palladium, bis(triphenylphosphine)palladium dichloride, or mixture of organic palladium and organic phosphine ligand in molar ratio of 1:2-20. The molar ratio of the catalyst to the compound (II) is 0.0001-0.05:1. The organic palladium is tris(dibenzylideneacetone)dipalladium. The organic phosphine ligand is tris(o-methylphenyl)phosphine. The organic solvent is tetrahydrofuran, N,N-dimethylformamide or toluene. The molar ratio of 2,5-dibromo-1,4-di-iodobenzene (a) and 3-bromo-2-trimethyltin thiophene is 1:1.1-1.5. The molar ratio of 2,5-dibromo-1,4-diiodobenzene, lithium chloride, and cuprous chloride is 1:5-1:5.2. The palladium catalyst (x) is bis(triphenylphosphine)palladium(II) dichloride or tetrakis(triphenylphosphine)palladium(0). The molar ratio of 2,2'-(2,5-dibromo-1,4-phenylene)-bis(3-bromothiophene) and alkylamine is 1:3-4. The palladium catalyst (y) is bis(triphenylphosphine)palladium(II) dichloride, tris(dibenzylideneacetone)dipalladium(0) or tetrakis(triphenylphosphine)palladium(0). The molar ratio of compound (d) to N-bromosuccinimide is 1:2.2-3.    TECHNOLOGY FOCUS - POLYMERS - Preparation (claimed): A 6,15-dibromo-5,14-dithia-9,18-diazapentacyclo(10.6.0.03,10.04,8.013,17)octadeca-1,3(10),4(8),6,11,13(17),15-heptaene (A) of formula (II) and 1,3-bis(5-(trimethylstannyl)selenophen-2-yl)-4H,5H,6H-thieno(3,4-c)pyrrole-4,6-dione of formula (II) in molar ratio of 1:1.1-1.5 are reacted at 60-120 degrees C for 24-72 hours in an organic solvent in presence of catalyst under inert gas atmosphere, separated and purified, to obtain conjugated polymer (I).