NOVELTY - An aromatic compound (II) and aromatic compound (III) are reacted in presence of catalyst, to obtain aromatic compound containing structural unit (I).    USE - Manufacture of aromatic compound used for manufacturing copolymer for functional material of electronic devices e.g. photoelectric conversion element and organic-semiconductor element, organic thin film for solar cell and transistor.    ADVANTAGE - The copolymer is formed using aromatic compound without using monomer containing boron and monomer containing tin.    DETAILED DESCRIPTION - An aromatic compound of formula: Ar'1-(Y')m (II) and aromatic compound of formula: Ar'2-(X)m (III) are reacted in presence of catalyst, to obtain aromatic compound containing structural unit of formula: (Z)m-1-Ar'1-Ar'2-(Z)n-1 (I).    m=2-4;    Y'=group of formula: -Si(-R1)(-R2)(-R3) (IV);    Ar'1=group obtaiuned by removing m number of H atoms to aromatic ring from optionally substituted aryl, group obtained by removing m number of H atoms to heterocyclyl ring from optionally substituted heterocyclyl compound, group obtained by removing m number of H atoms to aromatic ring from aromatic amine compound, or group obained by removing m number of H atoms to ethylene;    R1=alkoxy, aryloxy or monovalent hydrocarbyl in which H atom(s) is substituted by hydroxy;    R2,R3=H or substituent;    n=1-4;    X=leaving group;    Ar'2=group obtained by removing n number of H atoms to aromatic ring from optionally substituted aryl, group obtained by removing n number of H atoms to heterocyclyl ring from optionally substituted heterocyclyl compound, group obtained by removing n number of H atoms to aromatic ring from aromatic amine compound or group obtained by removing n number of H atoms from ethylene;and    R4-R9=H or hydrocarbyl.    An INDEPENDENT CLAIM is included for silicon-containing compound (V).    R10,R11,R16-R19,R24,R25=H or substituent;    R12-R15,R20-R23=H or hydrocarbyl;and    Ar'3=group obtained by removing two H atoms to aromatic ring from optionally substituted aryl, group obtained by removing two H atoms to heterocyclyl ring from optionally substituted heterocyclyl compound, group obtained by removing two H atoms to aromatic ring from aromatic amine compound, or group obtained by removing two H atoms from ethylene.