TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): An aromatic compound of formula (III) is reacted with halogenating agent, and coupling reaction of obtained aromatic compound of formula (IV) and monovalent group-containing compound of formula (V) is performed in presence of palladium catalyst, phosphine ligand and base, to obtain compound (I).Z=leaving group. SPECIFIC COMPOUNDS - 7 Boron-containing compounds e.g. 4-((2-(5'-(4-(5-(4-(bis(4-octylphenyl)amino)phenyl)thiophen-2-yl)-2,5-dioctyl-3,6-dioxo-2,3,5,6-tetrahydropyrrolo(3,4-c)pyrrol-1-yl)-4-(dimesitylboranyl)-(2,2'-bithiophen)-5-yl)thiazol-5-yl)ethynyl)benzoic acid of formula (Ia), 2-((2-(5'-(4-(5-(4-(bis(4-octylphenyl)amino)phenyl)thiophen-2-yl)-2,5-dioctyl-3,6-dioxo-2,3,5,6-tetrahydropyrrolo(3,4-c)pyrrol-1-yl)-4-(dimesitylboranyl)-(2,2'-bithiophen)-5-yl)thiazol-5-yl)methylene)malonic acid, 2-(5'-(4-(5-(4-(bis(4-octylphenyl)amino)phenyl)thiophen-2-yl)-2,5-dioctyl-3,6-dioxo-2,3,5,6-tetrahydropyrrolo(3,4-c)pyrrol-1-yl)-4-(dimesitylboranyl)-(2,2'-bithiophen)-5-yl)thiazole-5-carboxylic acid, 2-((2-(5'-(4-(5-(4-(bis(4-(hexyloxy)phenyl)amino)phenyl)thiophen-2-yl)-2,5-dioctyl-3,6-dioxo-2,3,5,6-tetrahydropyrrolo(3,4-c)pyrrol-1-yl)-4-(dimesitylboranyl)-(2,2'-bithiophen)-5-yl)thiazol-5-yl)methylene)malonic acid and 2-((2-(5'-(2,5-bis(2,6-bis((2-ethylhexyl)oxy)benzyl)-4-(5-(4-(bis(4-octylphenyl)amino)phenyl)thiophen-2-yl)-3,6-dioxo-2,3,5,6-tetrahydropyrrolo(3,4-c)pyrrol-1-yl)-4-(dimesitylboranyl)-(2,2'-bithiophen)-5-yl)thiazol-5-yl)methylene)malonic acid, are disclosed.    EXAMPLE - 76.9 mg 3-(5-(4-(Bis(4-octylphenyl)amino)phenyl)thiophen-2-yl)-6-(4'-(dimesitylboranyl)-5'-(5-iodothiazol-2-yl)-(2,2'-bithiophen)-5-yl)-2,5-dioctyl-2,5-dihydropyrrolo(3,4-c)pyrrole-1,4-dione, 8.18 mg 4-ethynylbenzoic acid and 1.02 mg triphenylphosphine were dissolved in 1.5 mL toluene, 1.07 mg tris(dibenzylideneacetone)dipalladium(0)-chloroform, 0.395 mg copper iodide and 0.5 mL diisopropylamine were added, and heated at 100 degrees C for 8 hours. The reaction mixure was cooled to room temperature, 2M hydrochloric acid aqueous solution was added, and aqueous layer was extracted using toluene. The organic layer was washed using saturated sodium chloride aqueous solution, solvent was distilled, and dried using sodium sulfate. The resultant mixture was purified by silica gel column chromatography, to obtain 56.8 mg 4-((2-(5'-(4-(5-(4-(bis(4-octylphenyl)amino)phenyl)thiophen-2-yl)-2,5-dioctyl-3,6-dioxo-2,3,5,6-tetrahydropyrrolo(3,4-c)pyrrol-1-yl)-4-(dimesitylboranyl)-(2,2'-bithiophen)-5-yl)thiazol-5-yl)ethynyl)benzoic acid with yield of 73%.