TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: Base is sodium carbonate, potassium carbonate, cesium carbonate, potassium tert.-butoxide, or sodium tert.-butoxide.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: Catalyst is tetra(triphenyl phosphine) palladium, tris(dibenzylideneacetone) palladium, or bis(triphenyl phosphine) palladium dichloride. Organic solvent is toluene, N,N-dimethyl formamide, chloroform, tetrahydrofuran, or methylene dichloride. Preferred Processes: Compound (A) is prepared by dissolving 2,7-dibromofluorene of formula (II) in anhydrous dimethyl sulfoxide at room temperature under inert gas, adding potassium tert.-butoxide and carbon disulfide, stirring reaction, adding methyl iodide, continuously stirring reaction to obtain 2,7-dibromo-9-(disulfide) methylene fluorene of formula (III) in which molar ratio 2,7-dibromofluorene:potassium tert.-butoxide is 1:2-2.4, molar ratio 2,7-dibromofluorene:carbon disulfide is 1:1-1.2, and molar ratio 2,7-dibromofluorene:methyl iodide is 1:1-1.2, dissolving prepared 2,7-dibromo-9-(disulfide) methylene fluorene in absolute tetrahydrofuran solvent at - 5 degrees C under inert gas protection, adding 1 mol/L diethyl ether solution of alkyl magnesium bromide, maintaining reaction temperature at 0 degrees C for greater than or equal to 30 minutes, adding 0.1 mol/L tetrahydrofuran solution of tetrachloro copper acid dilithium, stirring reaction for 4-8 hours to obtain alkylene fluorene derivative of formula (C) in which molar ratio 2,7-dibromo-9-(disulfide) methylene fluorene:alkyl magnesium bromide is 1:2-2.4, and molar ratio 2,7-dibromo-9-(disulfide) methylene fluorene:tetrachloro copper acid dilithium is 25-50:1, adding tetrahydrofuran solvent in compound (C) under inert gas protection, adding n-butyl lithium at - 70 to - 85 degrees C, stirring reaction for 0.5-4 hours, adding 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane of formula (IV) at - 70 to - 85 degrees C, raising temperature to room temperature, and reacting for 10-48 hours in which molar ratio compound (C):n-butyl lithium is 1:2-4, and molar ratio n-butyl lithium:2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane is 1:1-2. The 2,7-dibromo-9-(disulfide) methylene fluorene is purified by pouring reaction liquid in ice-water mixture after stopping reaction, adding concentrated ammonium hydroxide to remove unreacted methyl iodide, filtering precipitate, washing with water, drying, and recrystallizing using mixed solvent of ethyl acetate and tetrahydrofuran with ratio of 2:1. Compound (C) is purified by washing reaction solution for 10-20 minutes using 10% sodium hydroxide solution after stopping reaction, filtering using diatomite, extracting liquid phase filtrate layer using ethyl acetate, washing extract using 10% sodium hydroxide aqueous solution, sodium pyrosulfite solution, and saturated salt water, drying over sodium sulfate and vacuum distilling, performing silica gel column chromatography using petroleum ether, and vacuum distilling at - 35 to - 40 degrees C using 2-methyl pentane as recrystallization solvent. Compound (A) is purified by adding water and saturated salt solution to wash reaction solution when reaction is finished, extracting using chloroform or toluene solvent, drying over anhydrous sodium sulfate (Na2SO4) or anhydrous magnesium sulfate (MgSO4), collecting filtrate, rotary evaporating solvent to obtain crude product, and separating by silica gel column chromatography using eluent.    TECHNOLOGY FOCUS - POLYMERS - Preferred Processes: Polymeric semiconductor material containing alkylene fluorene and anthracene is purified after stopping Suzuki coupling reaction by adding deionized water in reaction liquid, extracting using toluene or chloroform, taking organic phase, evaporating some milliliters to 10 ml of mixed solution using vacuum distillation of polymer/toluene or chloroform solution, dropping anhydrous methanol while continuously stirring, gradually precipitating solid, filtering, drying to obtain solid powder, dissolving solid powder in toluene or chloroform, removing catalyst using neutral aluminum oxide chromatographic column, and spin drying polymer/toluene or chloroform solution. Preferred Definitions:    R1=4-40C straight-chain alkyl or 4-40C branched-chain alkyl; and    R2, R3=1-18C straight-chain alkyl or 1-18C branched-chain alkyl.