NOVELTY - Polyacene compound (1,2) is new.    USE - For organic semiconductor thin film used for manufacturing organic semiconductor element and transistor (both claimed). The semiconductor element includes diode, thin-film transistor used for liquid crystal display, distributed liquid crystal display, electrophoresis type display, particle rotation type display element, electrochromic display, organic light emitting display, electronic paper, signal driver circuit element, memory circuit element, signal processing circuit element, memory, inverter, integrated circuit card, smart card, operational element in electronic tag comprising memory, pulse generator, signal splitter, controller, and capacitor. Also used for light receiving elements such as photodiode, light emitting diode, optoelectric transducer, solar cell, infrared sensor, and other sensors such as gas sensor, biosensor, blood sensor, immunity sensor, artificial retina and taste sensor.    ADVANTAGE - The polyacene compound has excellent solubility with respect to solvent having high mobility. The organic semiconductor thin film formed from the compound has high mobility, and organic semiconductor element has excellent electronic property.    DETAILED DESCRIPTION - Polyacene compound of general formula (1 or 2) is new.    At least one of R1-R4 = aliphatic hydrocarbon such as alkyl, alkenyl, alkynyl, aromatic hydrocarbon, alkoxyl, ether, acyl, ester, carboxyl, formyl, halogen, amino, imino, amide, cyanogen, silyl, mercapton, sulfide, disulfide, sulfonyl, or functional group that contains 2 or more functional groups mentioned above, and remainder are hydrogen;and    n = 2-7 in formula (1) and 3-7 in formula (2).    INDEPENDENT CLAIMS are included for the following:    (i) quinone compound of formula (3);    (ii) synthesis of polyacene compound;    (iii) organic semiconductor thin film containing the polyacene compound and having crystallinity;    (iv) organic semiconductor element having a portion formed from organic semiconductor thin film; and    (v) transistor equipped with gate electrode, dielectric layer, source electrode, drain electrodes and semiconductor layer comprising organic semiconductor thin film.    At least one of R1,R2 = aliphatic hydrocarbons such as alkyl, alkenyl, alkynyl, aromatic hydrocarbon, alkoxyl, ether, acyl, ester, carboxyl, formyl, halogen, amino, imino, amide, cyanogen, silyl, mercapton, sulfide, disulfide, sulfonyl, or functional group that contains 2 or more functional groups mentioned above, and remainder are hydrogen;    p = integer greater than 1;and    p+q = 3-7;    DESCRIPTION OF DRAWING(S) - The figure shows proton nuclear magnetic resonance spectrum of 2,3,9,10-tetramethyl pentacene.