TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): Preparation of compound (I) involves coupling a compound of formula benzene (substituted on 1-position by OY1, on 2-position by X, on 4-position by OY1 and on 5-position by X) with a compound selected from pyridine (substituted on 3-position by Z), pyridine (substituted on 2-position by Z), pyridine (substituted on 4-position by Z), pyrimidine (substituted on 5-position by Z) and pyrimidine (substituted on 2-position by Z) in the presence of a metal containing catalyst such that compound (I) is prepared. The coupling reaction is a Suzuki cross coupling reaction of an aryl-boronic acid with an aryl-halide catalyzed by a palladium(0) complex.X=a metal or metalloid atom or an electrophile or leaving group;Y1=H or a protecting group;Z=a metal or metalloid atom or an electrophile or leaving group.Preferred Components: The aromatic difluoride is bis-(4-fluoro-phenyl)sulfone, bis-(4-fluorophenyl)phenyl-phosphine oxide, 4,4'-difluorobenzophenone or decafluorobiphenyl.    TECHNOLOGY FOCUS - POLYMERS - Preferred Compounds: The polymer or copolymer is a block copolymer, random copolymer, periodic copolymer and/or alternating polymer. The predetermined ratio is about 50/50. SPECIFIC COMPOUNDS - 2,5-Di(pyridin-3-yl)benzene-1,4-diol of formula (Ia) is disclosed as the compound (I).    EXAMPLE - 2,5-Dibromo-hydroquinone, tetrahydrofuran and 3,4-dihydro-2H-pyran was added to a degassed flask. The solution was stirred at 0degrees C under argon for 15 minutes. (+-)-Camphor-10-sulfonic acid was added and the solution was stirred at room temperature for 8 hours. The precipitated product was filtered and washed with distilled water. A small amount of cold hexane was added for better drying. The bis-(2-tetrahydro-2H-pyranyl(1)acid)-2,5-dibromobenzene was dried under vacuum and product was obtained at a 90% yield. Bis-(2-tetrahydro-2H-pyranyl(1)acid)-2,5-dibromobenzene and distilled tetrahydrofuran was added to a degassed three neck flask. Butyl-lithium solution was slowly added to the degassed solution at -80degrees C. The mixture was lifted for 3 hours at -40degrees C. The mixture was cooled again at -80degrees C and trimethyl borate was slowly added. The mixture was lifted under stirring at room temperature for 24 hours. The residue was treated with hexane for 24 hours. The product 2,5-(tetrahydro-2H-pyranyl(1)acid)phenyl diboronic acid was filtered and dried at 30degrees C under vacuum and the THP-protected diol was obtained at 55% yield. Tetrahydrofuran and 2M Na2CO3 were added to a degassed mixture of 3-bromopyridine, 2,5-(tetrahydro-2H-pyranyl(1)acid)phenyl diboronic acid, and Pd(PPh3)4 under continuous stream of argon. The solution was vigorously stirred at reflux for 4 days under argon. The residue was treated with MeOH, filtered, and dried at 40degrees C under vacuum. The THP-protected diol was obtained in 70% yield. HCl 37% was added to a solution of the THP-protected diol in THF and MeOH, and the mixture was then stirred at 50degrees C for 24 hours. Deprotonation was performed using 2M Na2CO3 and sinking of the product. Filtration, washing with water and cold hexane, and drying at 50degrees C under vacuum resulted in 2,5-di(pyridin-3-yl)benzene-1,4-diol in 60% yield.