TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The catalyst containing palladium is selected from: palladium compounds in oxidation state 0 or +2 such as palladium(II)chloride (PdCl2), palladium(II)acetate (Pd(OAc)2), bis(dibenzylidene)palladium(0) (Pd2(dba)3, where dba is C6H5CH=CHCOCH=CHC6H5), bis(acetonitrile)-palladium(II)chloride (Pd(CH3CN)2Cl2), bis(triphenyl-phosphine)palladium(II)chloride (Pd(PPh3)2Cl2), bis-(triphenylphosphine)palladium(II)acetate (Pd(PPh3)2(OAc)2), and/or tetrakis(triphenylphosphine)-palladium(0) (Pd(PPh3)4). The weak organic base is selected from: carboxylates of alkaline or of alkaline earth metals such as potassium acetate, sodium acetate, cesium acetate, magnesium acetate, calcium acetate, potassium propionate, sodium propionate, cesium propionate, magnesium propionate, and/or calcium propionate; carbonates of alkaline or of alkaline earth metals such as lithium carbonate, potassium carbonate, sodium carbonate, cesium carbonate, magnesium carbonate, and/or calcium carbonate; and/or bicarbonates of alkaline or of alkaline earth metals such as lithium bicarbonate, potassium bicarbonate, sodium bicarbonate, cesium bicarbonate, magnesium bicarbonate, and/or calcium bicarbonate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The monohalogenated dithiophene compound (II) and the internal alkyne (III) are used in a molar ratio of 1:2 to 1:10. The monohalogenated dithiophene compound (II) and the catalyst containing palladium are used in a molar ratio of 100:0.1 to 100:8. The monohalogenated dithiophene compound (II) and the catalyst containing copper in oxidation state +1 (IV) are used in a molar ratio of 1:0.2 to 1:1. When the compound (I) is 6,5-dibutylbenzo(2,1-b:3,4-b')dithiophene the method involves reacting 2-iodo-3,3'-dithiophene corresponding to a monohalogenated dithiophene compound (II), where X is I, with 5-decyne corresponding to an internal alkyne (III), where R1 and R2 are n-butyl. The process is carried out in the presence of at least one weak organic base. The monohalogenated dithiophene compound (II) and the weak organic base are used in a molar ratio of 1:2.2 to 1:20. The process is carried out in the presence of at least one dipolar aprotic organic solvent. The monohalogenated dithiophene compound (II) is used in the dipolar aprotic organic solvent in such a quantity as to have a molar concentration in the solvent of 0.05 M to 0.5 M. The process is carried out in the presence of at least one weak organic acid. The monohalogenated dithiophene compound (II) and the weak organic acid are used in a molar ratio of 1:0.1 to 1:1. The process is carried out at a temperature of 80 degrees C to 130 degrees C. The process is carried out for a time of 30 minutes to 2 hours. Preferred Components: The dipolar aprotic organic solvent is selected from: N,N-dimethyl acetamide (DMAc), dimethyl sulfoxide (DMSO), N-methyl-pyrrolidone (NMP), and/or N,N-dimethyl formamide. The weak organic acid is selected from acetic acid, propionic acid, and/or pivalic acid. SPECIFIC COMPOUNDS - Preparation of 1 compound i.e. 6,5-dibutylbenzo(2,1-b:3,4-b')dithiophene of formula (I') is specified as the benzodithiophene compound (I).    EXAMPLE - Preparation of 6,5-dibutylbenzo(2,1-b:3,4-b')-dithiophene was carried out as follows: following products were charged in order into a 100 ml Pyrex glass flask, equipped with a cooler: 1244 mg of potassium carbonate, 92 mg of pivalic acid, 105 mg of bis(triphenylphosphine)palladium(II)chloride (Pd(PPh3)2Cl2), 28 mg of copper(I)iodide (CuI), 376 mg of 2-iodo-3,3'-dithiophene dissolved in 5 ml of N,N-dimethylacetamide and finally 1244 mg of 5-decyne. The flask was then placed in an oil bath preheated to 100 degrees C for 1 hour. After cooling to room temperature (25 degrees C), a saturated aqueous solution of sodium chloride (50 ml) was added to the reaction mixture and the whole mixture was extracted with diethyl ether (3x 25 ml). The organic phase obtained was washed to neutrality with water (3x 25 ml) and subsequently anhydrified on sodium sulfate and evaporated. The residue obtained was purified by elution on a silica gel chromatographic column (eluent: heptane), obtaining 780 mg of 6,5-dibutylbenzo(2,1-b:3,4-b')dithiophene as a white solid (yield 86%).