TECHNOLOGY FOCUS - POLYMERS - Preparation (disclosed): Polymerization-reactive group-containing compound of formula: X11-A11-X12 and arylene structural unit-containing compound of formula: X13-A12-X14 are dissolved in an organic solvent and optionally base, and polymerized in presence of catalyst, to obtain high molecular compound.A11=structural unit (I), (II), (III) or (IV);A12=structural unit of formula: -(Ar')- (V);andX11-X14=polymerization-reactive group.Preferred Compound: The high molecular compound is of formulae (V)-(VIII).W1,W2=H, halo, carboxy, alkenyl, cycloalkenyl, boric-acid-ester residue, boric-acid residue or organic tin residue (optionally substituted by substituent);andAr'=arylene or bivalent heterocyclyl (both optionally substituted). Preferred Definitions:    Y1,Y2==CRc-;    Rc=H;    Z1,Z2=O;and    X1,X2=S.    EXAMPLE - 134.8 mg 7,19-Dibromo-4,4,16,16-tetrapentadecyl-3,15-dioxa-8,20-dithiahexacyclo(11.11.0.02,10.05,9.014,22.017,21)tetracosa-1,5(9),6,10,12,14(22),17(21),18,23-nonaene and dry tetrahydrofuran were added into a container and deaerated for 30 minutes by argon gas. 4.58 mg Tris(dibenzylidene acetone)dipalladium(0), 5.8 mg tri-tert-butylphosphonium tetrafluoroborate and 0.5 mL of 3 M potassium phosphate aqueous solution were added and deaerated for 30 minutes. The reaction solution was heated to 80 degrees C. Then, 2.5 mL dry tetrahydrofuran solution of 38.8 mg 4,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2,1,3-benzothiadiazole was dripped and stirred at 80 degrees C for 3 hours. 8 mL o-Chlorobenzene solution of 10 mg phenyl boric acid was added and stirred at 80 degrees C for 1.5 hours. 0.8 g sodium N,N-diethyldithiocarbamate trihydrate and 7.5 g water were added, stirred at 80 degrees C for 3 hours, and solid-liquid separation was carried out. Obtained organic layer was washed with water and 10 wt.% acetic acid aqueous solution, 104 mL acetone was dripped, obtained precipitate was filter-separated, purified by silica-gel column chromatography using o-dichlorobenzene as developing solvent, obtained o-dichlorobenzene solution was added to methanol, filtered, washed using acetone and dried, to obtain 74.6 mg high molecular compound having number average molecular weight of 5x 104 and weight average molecular weight of 8.3x 104.