TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): The adduct compound is obtained by reacting compound (c1) with aromatic ring-comprising compound of formula: Ar1Q (a1) to obtain adduct bimolecular compound of formula: Ar1Q'=Q'Ar1 (X), reacting adduct bimolecular compound (X) with iodine and disconnectably adding compound (c1) to condensed polycyclic aromatic compound of formula: Ar1Ar20Ar1 (XX).Q=-C(-CHO)=C(-Y'CH3)-;Q'=group of formula (q1);Ar20=fused-aromatic-ring portion;andor Ar1+Ar20=ring.Preferred Process: The compound (c1) is disconnected from condensed polycyclic aromatic compound (I) by pressure reduction and/or heating. The exo component and endo component of adduct compound are dissolved in solvent. The detachment and removal of compound (c1) are carried out by heating film with heating increase rate of 100 degrees C/minute or more. The heating is carried out by directly contacting base material having coated film to heated component, introducing base material having coated film to the heated region, and/or radiating electromagnetic waves to coated film or base material. The detachment and removal of compound (c1) is carried out under air. The organic-semiconductor film of organic-semiconductor device is obtained by solution method. The condensed polycyclic aromatic compound (I) and compound (c1) are mixed in solvent. The bicyclo-( alpha )-diketone portion is decomposed by light irradiation to form benzene ring portion, and to obtain condensed polycyclic aromatic compound (XX). The ( alpha )-diketone compound (XXX) is manufactured by reacting adduct bimolecular compound (X) with iodine. Preferred Composition: The adduct compound is dienophile, conjugated diene compound, exo adduct, or chalcogen-containing compound of formula (IA) or (IB) or its stereoisomer. The compound (c1) is chosen from formulae (II)-(VII). The compound (c1) having annular portion is of formula: R'-C(=O)-N=S=O, C(-CN)2=C(-CN)(-C(=O)-O-R1) or chosen from formulae (IIa)-(IIj). The condensed polycyclic aromatic compound (I) and condensed polycyclic aromatic compound (XX) are organic-semiconductor compound, or chosen from formulae (Ia)-(If). The content of stereoisomer having lowest thermal-desorption temperature is 50 mol% or more with respect to sum total adduct compound having lowest thermal-desorption temperature, and stereoisomer having lowest thermal-desorption temperature. The content of exo component and endo component of stereoisomer having lower thermal-desorption temperature is 50 mol% or more with respect to sum total of exo component and endo component of adduct compound having lower thermal-desorption temperature, and exo component and endo component of stereoisomer having lower thermal-desorption temperature. The organic-semiconductor film comprises crystals of condensed polycyclic aromatic compound (I) with major-axis diameter of 5 mu m or more. The solution contains crystallization inhibitor (0.1-100 mol%). The condensed polycyclic aromatic compound (XX) is chosen from formulae (XXI)-(XXV), or its stereoisomer. The ( alpha )-diketone compound (XXX) is chosen from formula (XXXI) or (XXXII). The crude product of condensed polycyclic aromatic compound (I) contains halogen, metal element or its compound, and/or aromatic compound as an impurity.R1-R5=bond, H, halo, hydroxy, amide, mercapto, cyano, 1-10C alkyl, 2-10C alkenyl, 2-10C alkynyl, 1-10C alkoxy, optionally substituted 4-10C aromatic group, 1-10C ester, 1-10C ether, 1-10C ketone, 1-10C amino, 1-10C amide, 1-10C imide or 1-10C sulfide;or R1+R2,R3+R4,R5+R2=ring;n=1-5;Z=bond, -O-, -C(R30)2-, -C(R30)=, -C(=O)-, -N(R30)-, or -S-;R30=H, halo, 1-10C alkyl, 2-10C alkenyl, 2-10C alkynyl, 1-10C alkoxy, optionally substituted 4-10C aromatic group, 1-10C ester, 1-10C ether, 1-10C ketone, 1-10C amino, 1-10C amide, 1-10C imide or 1-10C sulfide;R,R'=H, halo, hydroxy, amide, mercapto, cyano, 1-10C alkyl, 2-10C alkenyl, 2-10C alkynyl, 1-10C alkoxy, optionally substituted 4-10C aromatic group, 1-10C ester, 1-10C ether, 1-10C ketone, 1-10C amino, 1-10C amide, 1-10C imide or 1-10C sulfide;R"=H, halo, 1-10C alkyl, 2-10C alkenyl, 2-10C alkynyl, 1-10C alkoxy, 4-10C aromatic group, 1-10C ester, 1-10C ether, 1-10C ketone, 1-10C amino, 1-10C amide, 1-10C imide or 1-10C sulfide;andY'=chalcogen.(i) The condensed benzene ring portion of chalcogen-containing compound (IA) is optionally substituted; and (ii) The benzene ring portion of ( alpha )-diketone compound (XXX) is optionally substituted. Preferred Definitions:    Ar2=group chosen from groups of formulae (i)-(iv), or aromatic-ring portion or fused aromatic-ring portion substituted by halo, 1-20C alkyl, 2-20C alkenyl, 2-20C alkynyl, optionally substituted 4-20C aromatic group, 2-10C ester, 1-20C ether, 1-20C ketone, 1-20C amino, 1-20C amide, 1-20C imide or 1-20C sulfide;and    Ar1,Ar3=group chosen from groups of formulae (v)-(viii).    EXAMPLE - Dinaphthothienothiophene (100 mg) having weight average molecular weight of 340.46, and hexachlorocyclopentadiene (20 g) having weight average molecular weight of 272.77 were reacted at 160 degrees C for 24 hours or more. The reaction mixture was cooled to obtain adduct (20 mg) of dinaphthothienothiophene and hexachlorocyclopentadiene having weight average molecular weight of 886.