NOVELTY - Aryl-substituted butadiyne derivatives (I), excluding 3,3'-(buta-1,3-diyne-1,4-diyl)bis(3,1-phenylene)diboronic acid are new.    USE - The aryl-substituted butadiyne derivatives are useful in the manufacture of electro-optical materials e.g. laser printers based on organic photo conductor (OPC), organic light emitting diodes (OLED) and organic solar cells (OSC).    DETAILED DESCRIPTION - Aryl-substituted butadiyne derivatives of formula ((R1)n(G)-Ar1(G)-CC-CC-Ar2(G)-(R2)m(G)) (I), excluding 3,3'-(buta-1,3-diyne-1,4-diyl)bis(3,1-phenylene)diboronic acid are new.    Ar1, Ar2 = (hetero)aryl e.g. phenyl, biphenylyl, naphthyl, anthracenyl, pyridyl, pyrenyl, fluorenyl, carbazolyl or thienyl;    R1, R2 = H, 1-40C, preferably 1-15C alkyl (e.g. methyl, ethyl, propyl, isopropyl or 2-ethylhexyl), 5-40C, preferably 5-25C aryl (e.g. phenyl, naphthyl, anthracenyl, pyrenyl, fluorenyl, carbzolyl or thienyl), arylvinyl e.g. styryl or arylethinyl, 1-40C, preferably 1-15C alkoxy (e.g. methoxy, ethoxy, n-propoxy, iso-propoxy or 2-ethyl-hex-1-yl-oxy), halo (preferably F), CN, NO2, SO2 or SO2R1, where at least one of the groups Ar1 and Ar2 and/or substituted R1 and R2 is substituted by at least one boron containing group G;    G = Ga, Gb or Gc;    Ga = (-B(X)(Y1));    Gb = (-B-(X)(Y1)(Z+));    Gc = (-B-(X)(Y1)(Z)W1+);    X = OR3, NR3, SR3 or halo;    Y1 = OR4, NR4, SR4 or halo;    Z = OR5, NR5, SR5 or halo; either    R3, R4, R5 = H, 1-20C alkyl (e.g. methyl, ethyl, propyl, isopropyl, pentyl, neopentyl or hexyl), aryl (e.g. phenyl), aralkyl (e.g. benzyl) or heterocyclyl (e.g. pyrid-4-yl); or    R3R4 and/or R4R5 = a ring with at least 1C, e.g. methylene, ethan-1,2-ylidene, ethen-1,2-ylidene, 2,3-dimethyl-butan-2,3-ylidene, 2,2-dimethyl-propan-1,3-ylidene, 3-aza-pentan-1,5-ylidene, 1,2-phenylene or 1,8-naphthylene;    W1 = alkali metal (e.g. Li, Na, K or Cs), alkaline earth metal (e.g. Ca or Mg) or complex organic cation (e.g. tetraalkylammonium (e.g. tetramethylammonium, tetrabutylammonium, trimethylbenzylammonium), tetraalkylphonsphonium (e.g. tetrabutylphosphonium or tetraoctylphosphonium); and    n, m = 0 (unsubstituted) up to maximum possible number of substitutable H-atoms in the unsubstituted Ar1 and Ar2 (completely substituted), preferably 1-5.