TECHNOLOGY FOCUS - POLYMERS - Preferred Structure: The high molecular compound further contains repeating unit of formula: -(Ar)- (2a), preferably of formula (2 or 3).Ar=arylene or heteroarylene group (both optionally substituted);rings A, B=optionally substituted aromatic hydrocarbyl ring, and have two bonds simultaneously on rings A, B;andR2,R3=H, alkyl, alkoxy, alkylthio, alkenyl, alkynyl, aryl, aryloxy, arylthio, arylalkyl, aryl alkoxy, aryl alkylthio, aryl ethenyl, aryl ethynyl, optionally substituted (amino, silyl or carboxyl), halo, acyl, acyloxy, imine, amide, acid imide, heteroaryl or cyano. Preferred Definitions:    Y1,Y2=halo, alkylsulfonate, arylsulfonate, aryl alkyl sulfonate, boric acid residue or boric acid ester residue.    EXAMPLE - Potassium hydroxide (in g) (1.4) was added to 2,7-dibromofluorene (6.9) in mixture of water (1 ml) and tetrahydrofuran (50 ml). 2,2'-Bithiophene-5-carboxy aldehyde (5) was added and the contents were heat-refluxed for 6 hours. The solvent was distilled off and tetrahydrofuran/methanol was added. The precipitate obtained was washed with water to obtain 5-(2,7-dibromo-fluoren-9-ylidene-methyl)-(2,2')bithiophenyl (8) with purity of 99.5%. 2,7-Bis(1,3,2-dioxa-borolan-2-yl)-9,9-dioctylfluorene (0.88), obtained monomer (0.85), palladium bis(triphenylphosphine)chloride (1.2 mg), trioctyl methyl ammonium chloride (0.3) and toluene (51 ml) were heated at 105 degrees C. Sodium carbonate aqueous solution was added and the reaction liquid was refluxed for 4 hours. Phenyl boric acid (0.03) was further added and the contents were heat-refluxed for 3 hours. Liquid mixture of sodium N,N-diethyldithio carbamate trihydrate (0.4) and water (6 ml) was added and stirred. The organic layer was washed with water and acetic acid aqueous solution, and purified. Methanol was added to the purified layer and high molecular compound (0.8) with number average molecular weight of 81000 and weight average molecular weight of 220000 was precipitated. The thin film transistor produced using the high molecular compound had field effect mobility of 0.013 cm2/V.