TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The material further comprises a solvent, a processing aid, or their mixture. The catalyst (A) comprises methyl cyanide, ethyl cyanide, triphenyl phosphine, palladium triphenyl phosphine, potassium carbonate, potassium hydroxide, tetrahydrofuran, 2-ethylhexylbromide, 2-(2-(2-methoxyethoxy)ethoxy)ethylbromide, toluene, or their mixture. The catalyst (B) comprises triethyl phosphite.    TECHNOLOGY FOCUS - POLYMERS - Preparation (Claimed): A substituted aromatic compound and a halogen-containing aromatic compound are reacted with a catalyst (A) to form an intermediate aromatic compound (I1). The compound (I1) is mixed with a catalyst (B) to form an intermediate aromatic compound (I2). Dihalo indolocarbazole monomer of formula (III) or (IV) is obtained from compound (I2).R1-R4=alkyl, aromatic heteroalkyl, or heteroaromatic group;X=halo;andu,v=1-3.Preferred Polymer: The polymer comprises a copolymer, a homopolymer, a block copolymer, or their mixture. The polymer is chosen from poly(N,N'-Di(2'-ethylhexyl)-5,11-dihydroindolo(3,2-b)carbazole), poly(N,N'-bis(2-(2-(2-methoxyethoxy)ethoxy)ethyl)-5,11-dihydroindolo(3,2- b)carbazole), poly(N,N'-bis(2-(2-(2-methoxyethoxy)ethoxy)ethyl)-5,11-dihydroindolo(3,2- b)carbazole-co-(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)-phenylene), poly(N,N'-bis(2-(2-(2-methoxyethoxy)ethoxy)ethyl)-5,11-dihydroindolo(3,2- b)carbazole-co-9,9-bis(2-(2-(2-methoxyethoxy)ethoxy)ethyl)-fluorene), poly(9,9-bis(2-(2-(2-methoxyethoxy)ethoxy)ethyl)fluorene), poly(2-(9,9-bis-(2-ethyl-hexyl)-7-methyl-9H-fluoren-2-yl)-6-(9-(2-ethyl-butyl)-9-(2-ethyl-heptyl)-7-methyl-9H-fluoren-2-yl)-benzo(1,2-d,4,5-d')bisoxazole), its conjugate, or derivative. EXAMPLE - A 250-mL flask charged with 3,9-dichloro-5,11-dihydroindolo(3,2-b)carbazole (in g) (9.76) and potassium hydroxide (16.84) was flushed with nitrogen. Tetrahydrofuran (100 mL) was then added. The mixture was heated and maintained at 80 degrees C for 2 hours. 2-Ethylhexylbromide (23.17) was added to reaction mixture and maintained at the same conditions for 20 hours. The mixture was allowed to cool to room temperature and poured into water (150 mL), and then extracted with hexane. The combined organic layer was washed with water and brine (150 mL), and then dried over magnesium sulfate. The crude product was purified to obtain N,N'-Di(2'-ethylhexyl)-3,9-dichloro-5,11-dihydroindolo(3,2-b)carbazole.