TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The alkali is tetramethyl ammonium hydroxide aqueous solution, tetrabutyl ammonium hydroxide aqueous solution, tetraethyl ammonium hydroxide aqueous solution, tetrapropyl ammonium hydroxide aqueous solution, tetrahexyl ammonium hydroxide aqueous solution, tetraoctyl ammonium hydroxide aqueous solution, potassium acetate or potassium carbonate. The concentration of alkali (excluding potassium acetate and potassium carbonate) is 5-50 %mass.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The catalyst is palladium catalyst, preferably palladium(II) acetate, (1,1-bis(diphenylphosphino)ferrocene)dichloro palladium(II) or tetrakis(triphenylphosphine)palladium(0). The ligand is tricyclohexyl phosphine fluoroborate, tricyclohexyl phosphine, tritert-butyl phosphine, triphenylphosphine or triethylenediamine. The molar ratio of ligand to catalyst is 4-12:1.7. The molar ratio of alkali to fluorene, benzene or biphenyl diborate is 4-12:1. The molar ratio of bromobenzene to fluorene, benzene or biphenyl diborate is 1:1. The solvent is methylbenzene, benzene or dimethylbenzene. The fluorene, benzene or biphenyl diborate is 4,4,5,5-tetramethyl-2-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)-1,3,2-dioxaborolane, 4,4,5,5-tetramethyl-2-(4-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)phenyl)-1,3,2-dioxaborolane, or of formula (II).    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The thiophene oligomer is of formula (III). The molar ratio of thiophene oligomer and 4,7-dibromo-2,1,3-diazosulfide is X:0.5-X, where X is 0.1-0.4. The molar ratio of total weight of 4,7-dibromo-2,1,3-diazosulfide and thiophene oligomer to fluorene, benzene or biphenyl diborate is 1:1. The molar ratio of the total weight of 4,7-dibromo-2,1,3-diazosulfide, thiophene oligomer and fluorene, benzene or biphenyl diborate to catalyst is 1:0.003-0.1, preferably 1:0.04. The molar ratio of phenylboronic acid to total amount of 4,7-dibromo-2,1,3-diazosulfide and thiophene oligomer with bromines at two ends is 1:1. The total concentration of 4,7-dibromo-2,1,3-diazosulfide, thiophene oligomer and fluorene, benzene or biphenyl diborate is 0.1-0.5 mol/L.