TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): The preparation of (I) comprises converting halogen compounds to the corresponding organometallic compounds e.g. magnesium or organolithium compounds, which are then converted into corresponding boronic acid derivatives. Preferred Definitions:    Ar1, Ar2 = optionally substituted 1,2-phenylene, 1,3-phenylene or 1,4-phenylene or optionally substituted mononuclear aromatic heterocyclic compound e.g. thiophenyl or pyridinyl, optionally substituted polyphenylene or polyheterophenylene e.g. biphenylene, terphenylene or quaterphenylene, bithienyl, thieno(3,2-b)thienyl, dithieno(3,2-b;2',3'-d)thienyl, naphthylene, antracenylene, phenantrenylene or pyrenylene or aromatic ring connected by a saturated link of at least 1C- atom, preferably 2-4C or aromatic rings connected through heteroatom, preferably N, O, S or Si or aromatic ring connected by an unsaturated link of at least 2C atoms, preferably 2-4C (ethenyl- or ethynylene unit);    G = (-B(OH)(OH)), 4-methylhexahydro-(1,3,2)oxazaborolo(2,3-b)(1,3,2)oxazaborol-4-ium-8-uid-8-yl, (-B-(F)3Li+), (-B-(F)3Na+), (-B-(F)3K+), (-B-(F)3N+(C4H9)4), (-B(OCH3)2), (-B(OC2H5)2), (-B(OC3H7)2), 4,4,5,5-tetramethyl-(1,3,2)dioxaborolan-2-yl, 5,5-dimethyl-(1,3,2)dioxaborinan-2-yl, benzo(1,3,2)dioxaborol-2-yl, 2,3-dihydro-benzo(1,3,2)oxazaborol-2-yl or 1,3-dimethyl-2,3-dihydro-1H-benzo(d)(1,3,2)diazaborol-2-yl group; and    R1, R2 = at least one, preferably 1-4 triphenylamine units and/or diphenylamino units.    SPECIFIC COMPOUNDS - 552 Compounds (I) are specifically claimed e.g. 1,4-diphenyl butadiyne-4',4''-diboronic acid of formula (Ia), 4',4''-bis-(4,4,5,5-tetramethyl-(1,3,2) dioxaborolane-2-yl)-1,4-diphenylbutadiyne, 1,4-diphenylbutadiyne-4',4''-bistrifluoroborate dipotassium salt, bis(9,9-dimethylfluorene-7-yl)-butadiyne-2',2''-diboronic acid and 4,4'-(4,4'-(buta-1,3-diyne-1,4-diyl)bis(4,1-phenylene))bis(phenylazanediyl)bis(4,1-phenylene)diboronic acid.    EXAMPLE - 4',4''-Dibromo-1,4-diphenyl butadiyne (4 g) was provided in water- and oxygen free tetrahydrofuran (100 ml) and the reaction mixture was cooled to -78 degrees C. Within 30 minutes, a solution of n-butyl lithium in hexane (14 ml) was added dropwise to the reaction mixture and the reaction mixture was heated to -60 degrees C, and stirred for 1 hour. Then the reaction mixture was cooled to -78 degrees C. Then tri-isopropyl borate (5 g) was added dropwise to the reaction mixture within 15 minutes and the reaction mixture was allowed to warm up overnight to room temperature. Then the reaction mixture was cooled to -10 degrees C and was mixed with 10% hydrochloric acid. Then the tetrahydrofuran was removed under vacuum and the obtained residue was boiled in water (200 ml), filtered hot and was dried under vacuum to obtain 1,4-diphenyl butadiyne-4',4''-diboronic acid with an yield of 89%.