TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The weak organic base is: carboxylates of alkaline or alkaline-earth metals comprising 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 alkaline-earth metals comprising lithium carbonate, potassium carbonate, sodium carbonate, cesium carbonate, magnesium carbonate and/or calcium carbonate; bicarbonates of alkaline or alkaline-earth metals comprising lithium bicarbonate, potassium bicarbonate, sodium bicarbonate, cesium bicarbonate, magnesium bicarbonate and/or calcium bicarbonate. The catalyst containing palladium is compounds of palladium in oxidation state (0) or (II) comprising palladium(II) chloride, palladium(II) acetate, bis(dibenzylidene)palladium(0) and/or bis(acetonitrile)palladium(II) chloride.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The compounds (II) and (III) are used in a molar ratio of 1:2-1:20. The process is carried out in the presence of at least one weak organic base and at least one catalyst containing palladium. The compound (II) and the weak organic base are used in a molar ratio of 1:2.2-1:20. The compound (II) and the catalyst containing palladium are used in a molar ratio of 100:0.1-100:3. The compound (II) is used at a molar concentration of 0.05-2 M. The process is carried out in the presence of at least one dipolar aprotic organic solvent. The compound (II) is used in the dipolar aprotic organic solvent in such a quantity so as to have a molar concentration in the solvent of 0.05-0.5 M. The process is carried out at a temperature of 80-170 degrees C. The process is carried out for 30 minutes to 36 hours. Preferred Components: (II) is 4,7-di-bromo-2,1,3-benzothiadiazole and (III) is 2-bromo-3-dodecyl-thiophene. The dipolar aprotic organic solvent is N,N-dimethylacetamide, dimethylsulfoxide, N-methylpyrrolidone and/or N,N-dimethylformamide. Preferred Definitions:    W1, Y1 = S;    Z = N or CR2;    R2 = H or dodecyl; and    R1, R3, R4 = H.    SPECIFIC COMPOUNDS - 1 Specific compound (I) is prepared i.e. 4,7-bis-(5-bromo-4-dodecyl-2-thienyl)-2,1,3-benzothiadiazole of formula (Ia).    EXAMPLE - 0.294 g of 4,7-Dibromo-2,1,3-benzothiadiazole, 0.295 g of potassium acetate, 5 ml of N,N-dimethylacetamide, 0.994 g of 2-bromo-3-dodecylthiophene and 1.2 mg of palladium(II) acetate were charged into a glass reactor equipped with a screw stopper. The reactor was placed in an oil bath preheated to 130 degrees C and left under vigorous stirring for 24 hours. After cooling to room temperature, the reaction mixture was introduced into a saturated solution of 25 ml of sodium chloride and extracted with ethyl acetate. The organic phase obtained was dried on anhydrous sodium sulfate and evaporated. The residue obtained was purified by flash chromatography to obtain pure 4,7-bis-(5-bromo-4-dodecyl-2-thienyl)-2,1,3-benzothiadiazole (124 mg, 23%).