TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): Preparation of (I) comprises reacting 1,6-dihydro-dicyclopenta(b,g)naphthalene compounds of formula (V) with aryl compounds of formula (VI).T = Sn(R61)(R62)(R63);R61-R63 = 1-10C-alkyl; andX = halo (substituted), preferably Br, Cl, N-bromosuccinimide or 1,2-dibromo-tetrachloroethane.Preferred Method: (V) are prepared by reacting 1,6-dihydro-dicyclopenta(b,g)naphthalene compounds of formula (VII) with tin compounds of formula (Sn(R61)(R62)(R63)). The method comprises: reacting (VII) with naphthalene-2,6-dicarbaldehyde compounds of formula (IX) to prepare naphthalene compounds of formula (X); halogenating (X) to prepare compounds of formula (XI); reacting (XI) with ketone compounds of formula (HZ-CH2-C(=O)-R) to prepare 1,6-dihydro-dicyclopenta(b,g)naphthalene-2,7-dicarbaldehyde compounds of formula (XIII); and reacting (XIII) with (VII) to prepare (I).P1 = protecting group, preferably N,N-dimethyl ethylenediamine, N,N-dimethyl ethylene diamine, 1,3-propane diol, 1,3-propane dithiol or pinacol; andR = hydroxyl or 1-20C-alkoxy. SPECIFIC COMPOUNDS - 3 Compounds (I) are disclosed, i.e. 1-(5-(7-(5-(2,5-bis(2-ethylhexyl)-3,6-dioxo-4-(5-(5-(2-thienyl)-2-thienyl)-2-thienyl)pyrrolo(3,4-c)pyrrol-1-yl)-2-thienyl)-4,9-bis(2-ethylhexoxy)benzothiopheno(6,5-f)benzothiophen-2-yl)-2-thienyl)-2,5-bis(2-ethylhexyl)-4-(5-(5-(2-thienyl)-2-thienyl)-2-thienyl)pyrrolo(3,4-c)pyrrole-3,6-dione of formula (Ia), 7-(7-(5,6-difluoro-7-(5-(5-hexyl-2-thienyl)-2-thienyl)-2,1,3-benzothiadiazol-4-yl)-4,10-bis(2-ethylhexoxy)benzothiopheno(6,5-f)benzothiophen-2-yl)-5,6-difluoro-4-(5-(5-hexyl-2-thienyl)-2-thienyl)-2,1,3-benzothiadiazole, and 4-(5-(4,10-bis(2-ethylhexoxy)-7-(5-(2-(2-ethylhexyl)-5,6-difluoro-7-(5-(5-(2-thienyl)-2-thienyl)-2-thienyl)benzotriazol-4-yl)-2-thienyl)benzothiopheno(6,5-f)benzothiophen-2-yl)-2-thienyl)-2-(2-ethylhexyl)-5,6-difluoro-7-(5-(5-(2-thienyl)-2-thienyl)-2-thienyl)benzotriazole.    EXAMPLE - 135 mg of 5,10-Bis(trimethyltin)-3,8-di(ethylhexyloxy)naphtho(3,2-b:7,6-b')thiophene, 180 mg of 5,6-difluoro-4-(4-(5-hexyl-thiophen-2-yl)-cyclopenta-1,3-dienyl)-7-iodo-benzo(1,2,5)thiadiazole and 5 mole% of tetrakis(triphenylphosphine)palladium(0) were added to 50 ml of purified toluene and 3 ml of N,N-dimethylformamide at 105 degrees C for 12 hours under argon gas. After completion of the reaction, the reaction mixture was cooled. 150 ml of Methanol was added to the reaction mixture to form precipitate. The obtained precipitate was stirred for 5 hours and then the solid was filtered off and purified by column chromatography (hexane/chloroform) to obtain 100 mg of 7-(7-(5,6-difluoro-7-(5-(5-hexyl-2-thienyl)-2-thienyl)-2,1,3-benzothiadiazol-4-yl)-4,10-bis(2-ethylhexoxy)benzothiopheno(6,5-f)benzothiophen-2-yl)-5,6-difluoro-4-(5-(5-hexyl-2-thienyl)-2-thienyl)-2,1,3-benzothiadiazole (yield 46%), as a dark red color solid.