TECHNOLOGY FOCUS - POLYMERS - Preparation (disclosed): The high molecular compound is manufactured by dissolving 5,14-dithiapentacyclo-octadeca-heptaene derivative of formula: X11-A11-X12, and arylenyl-group-containing compound of formula: X13-A12-X14 in an organic solvent, adding base to the dissolved mixture, and polymerizing the reaction mixture by performing aryl-coupling reaction in presence of catalyst.A11=group of formula (I);A12=group of formula: -Ar-;X11-X14=polymerization-reactive group;andAr=arylenyl or bivalent heterocyclyl (all optionally substituted).Preferred Composition: The 5,14-dithiapentacyclo-octadeca-heptaene derivative (I) is of formula (2a), (2b), (2c) or (3a). The 5,14-dithiapentacyclo-octadeca-heptaene derivative further comprises arylenyl-group-containing compound of formula:-Ar- (IV). The tetracyclo-hexadeca-1,4,6,8,10(14),12,15-heptaene derivative (5a) is of formula (6a).X1,X2=O, S or Se;Y1,Y2=N or CR5=;R5=H, alkyl, alkoxy, alkylthio, aryl, monovalent heterocyclyl or halo (all optionally substituted);R1a-R4a=H, alkyl, alkoxy, alkylthio, aryl, monovalent heterocyclyl, halo, silyl, amino, alkenyl, alkynyl, hydroxy, nitro, cyano, carboxy, alkyl-carbonyl or alkoxycarbonyl (all optionally substituted);andR6,R7=H, alkyl, alkoxy, alkylthio, aryl, monovalent heterocyclyl, halo, silyl, amino, alkenyl, alkynyl, hydroxy, nitro, cyano, carboxy, alkyl carbonyl, alkoxycarbonyl, boric-acid-ester residue, boric-acid residue, or organic-tin residue (all optionally substituted).at least one of R1a-R4a is alkyl, alkoxy, alkylthio, amino or hydroxy. Preferred Definitions:    X1,X2=S;and    Y1,Y2=-CH=.    EXAMPLE - 137.6 mg 6,17-Dibromo-10,21-dimethoxy-3,3,14,14-tetramethyl-7,18-dithiahexacyclo(10.10.0.02,9.04,8.013,20.015,19)docosa-1,4(8),5,9,11,13(20),15(19),16,21-nonaene, and 3.5 ml dry tetrahydrofuran were added inside a reaction container in which reflux tube was attached, and de-aerated for 30 minutes by argon-gas bubbling. 4.58 mg Tris(dibenzylidene acetone)dipalladium (0), 5.80 mg tri-tert-butyl phosphonium tetrafluoroborate, 0.5 ml 3-M potassium phosphate aqueous solution were added to the mixture and de-aerated for 30 minutes. The obtained reaction solution was heated at 80 degrees C or less. 2.5 ml Dry tetrahydrofuran solution of 38.8 mg 6,15-dibromo-9,9,18,18-tetramethyl-5,14-dithiapentacyclo(10.6.0.03,10.04,8.013,17)octadeca-1,3(10),4(8),6,11,13(17),15-heptaene was de-aerated for 30 minutes by argon gas bubbling, stirred at 80 degrees C for 3 hours. By argon gas bubbling, 8 ml o-chlorobenzene solution of 10 mg phenyl boric acid was de-aerated for 30 minutes, 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, and stirred at 80 degrees C for 3 hours. After liquid-separating organic layer from the obtained reaction solution, the obtained organic layer was cleaned in water and 10 wt.% acetic acid aqueous solution. The precipitate was obtained by dripping 104 ml acetone to the obtained organic layer. After purifying the obtained precipitate in the silica gel column using o-dichlorobenzene as developing solvent, solid was obtained by pouring the obtained o-dichlorobenzene solution into methanol. The obtained solid was filtered, and washed using acetone, and 34 mg high molecular compound was obtained by drying. The obtained high molecular compound had number average molecular weight of 1.7x 104 based on polystyrene conversion, and weight average molecular weight of 5x 104.