TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): Active functional group-containing compound of formula (11): X-(W')h is coupled with protecting group-containing compound of formula (12) to obtain protecting group-containing branched compound of formula (13), and active groups are introduced to obtain active group-containing branched compound of formula (14). Then, protecting group-containing compound of formula (12) is coupled with obtained compound of formula (14) to obtain protecting group-containing branched compound of formula (15), and active groups are introduced to obtain active group-containing branched compound of formula (16). Then, active functional group-containing compound of formula: V-Y' is coupled with compound of formula (16) to obtain protecting group-containing branched compound of formula (18).X,T,L,Y'=same as defined above;W',V=active functional group;Z=protecting group;andh=2 or more.Preferred Components: The core portion of branched compound is divalent organic group of formula (8). The branched compound comprises thiophene-containing repeating unit of formula (9).Ar2=optionally substituted aromatic bivalent hydrocarbon or optionally substituted bivalent heterocyclic group;R6-R9=ary or monovalent heterocyclic group ptionally substituted by fluorine, alkyl or alkoxy;p,q,r=0-10, where sum of p and r is 5-20;R10,R11=hydrogen atom optionally substituted by fluorine, alkyl or aryl;andk=3-10. Preferred Definitions:    L=divalent organic group of formula (2);    Ar1=optionally substituted aromatic bivalent hydrocarbon or optionally substituted bivalent heterocyclic group;    R1-R4=hydrogen, alkyl, alkoxy, optionally substituted aryl, or optionally substituted monovalent heterocyclic group;    m,n,o=0-5, where sum of m and o is 3-10;    T=trivalent organic group of formulae (3-7);and    R5=hydrogen, alkyl, aryl or cyano.    EXAMPLE - Tributyltin-containing compound of formula (45) (in g) (1.12), 3,5-dibromoiodobenzene (553 mg) and toluene (12 ml) were reacted in presence of tetrakis triphenyl phosphine palladium (74 mg), heated, refluxed and filtered to obtain dibromodiphenyl-containing thiophene of formula (A). Phenyl-containing thiophene compound of formula (B) (0.8) obtained by reacting compound of formula (46), phenyl boronic acid, sodium carbonate in presence of tetrakis triphenyl phosphine palladium, was dried by heating, and tetrahydrofuran was added into the compound and stirred for 30 minutes. Then, chlorinated tributyl tin was added into the resulting mixture and stirred for 3 hours, filtered and dried to obtain tin tributyl-containing thiophene compound of formula (C). Then, obtained compound of formula (A) (210 mg) and compound of formula (B) (650 mg) and toluene (5 ml) were reacted in presence of tetrakis triphenyl phosphine palladium (29 mg), heated and refluxed for 12 hour, filtered and dried to obtain bis-phenyl-thiophene-containing compound of formula (D). The obtained bis-phenyl-thiophene-containing compound (149 mg), potassium hydroxide (0.2), tetrahydrofuran (8 ml) and methanol (1 ml) were mixed and stirred at room temperature for 30 minutes. Then, dichloromethane (10 ml) and water were added to the resulting mixture, filtered and dried, copper acetate(II)monohydrate and N,N,N',N'-tetraethylene diamine and tetrahydrofuran were added into the resulting mixture, heated and refluxed for 12 hours and filtered to obtain tetrakis-phenyl-thiophene-triple bond-containing compound of formula (E). Then, obtained tetrakis-phenyl-thiophene- triple bond-containing compound (80 mg), sodium sulfide nonahydrate (110 mg) and tetrahydrofuran (12 ml) were heated, refluxed for 12 hours and filtered to obtain tetrakis-phenyl-thiophene-containing compound of formula (F).    a=thiophene-containing group of formula (e);and    b= thiophene-containing group of formula (f).