TECHNOLOGY FOCUS - POLYMERS - Preparation (Disclosed): Preparation of (Q1) comprises condensation reaction of an aromatic boronate and a halide, preferably a bromide in the presence of catalysts comprising 2-dicyclohexylphosphino-2',6'-di-alkoxybiphenyl/palladium(II)acetates, tri-alykl-phosphonium salts/palladium(0) derivatives and tri-alkylphosphine/palladium(0) derivatives, preferably 2-dicyclohexylphosphino-2',6'-di-methoxybiphenyl (sPhos)/palladium(II)acetate and, tri-tert-butylphosphonium tetrafluoroborate/tris(dibenzylideneacetone) dipalladium(0) and tri-tert-butylphosphine/tris(dibenzylideneacetone) dipalladium(0). Preferred Definitions:    Ar5-Ar7 = divalent radical of formula (a11)-(a13); and    D1 = (a11)-(a13), a divalent radical of formula (d11)-(d14).    EXAMPLE - 600 mg of 5,7-Bis-(4,4,5,5-tetramethyl-(1,3,2)dioxaborolan-2-yl)-2,3-dihydro-thieno(3,4-b)(1,4)dioxine and 1.152 g of 3,6-bis(5-bromothiophen-2-yl)-2,5-bis(2-butyloctyl)pyrrolo(3,4-c)pyrrole-1,4(2H,5H)-dione were introduced in a flask and flushed with argon. Then 50 ml of dry tetrahydrofuran was added by syringe and the resulting solution was heated to reflux temperature and a solution of 9.8 mg of palladium(II) acetate and 58.7 mg of 2-(di-tert-butylphosphino)-1-phenylindole in 5 ml of tetrahydrofuran was added at 50 degrees C. The resulting mixture was stirred for 5 minutes at 60 degrees C. Then 383 mg of finely crushed lithium hydroxide monohydrate was added in a single portion and the mixture was stirred at reflux temperature for 2 hours. The obtained reaction mixture was cooled and poured into 75 ml of water and the precipitate was filtered. The filtered solid was then put in a flask containing 140 ml of o-dichlorobenzene and 7 g of sodium diethyldithiocarbamate dissolved in 140 ml of water. The mixture was heated under vigorous stirring at 95 degrees C overnight. Then phases were separated, and the organic phase was washed thrice with 100 ml of water. Ethanol was added to precipitate the product, which was filtered and dried under reduced pressure at 60 degrees C. The dried solid was worked up to obtain 820 mg, yield 73% of polymer having units derived from 2,5-bis-(2-butyl-octyl)-3-(5-(2,3-dihydro-thieno(3,4-b)(1,4)dioxin-5-yl)-thiophen-2-yl)-6-thiophen-2-yl-2,5-dihydro-pyrrolo(3,4-c)pyrrole-1,4-dione of formula (P1) with a molecular weight of 4075, and a polydispersity index of 1.22.