TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): Preparation of (I) comprises reacting fluorene compounds of formula (a) with phenyl-thiophene compounds of formula (b) in the presence of metal e.g. palladium copper or tin, metal catalyst e.g. palladium(II) acetate, base e.g. sodium carbonate or triethylamine, and solvent e.g. benzene or diethyl ether.X, G = halo, borono, (4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl), (5,5-dimethyl-1,3,2-dioxaborinan-2-yl) or 1,3,2-dioxaborinan-2-yl.Preferred Components: (I) are symmetric compounds. Preferred Definitions:    R11, R12 = CH3, C2H5, n-propyl, isopropyl, n-butyl, tert-butyl, pentyl or hexyl;    R21, R22 = CH3, C2H5, n-propyl, isopropyl, n-butyl, tert-butyl, pentyl, hexyl, heptyl, octyl, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, tert-butoxy or pentyloxy; and    n, m = 1-3.    SPECIFIC COMPOUNDS - 29 Compounds (I) are disclosed e.g. 2-(9,9-dihexyl-7-(5-(4-octylphenyl)-2-thienyl)fluoren-2-yl)-5-(4-octylphenyl)thiophene of formula (Ia), 2-(9,9-dimethyl-7-(5-(p-tolyl)-2-thienyl)fluoren-2-yl)-5-(p-tolyl)thiophene, 2-(9,9-dipropyl-7-(5-(p-tolyl)-2-thienyl)fluoren-2-yl)-5-(p-tolyl)thiophene, 2-(9,9-dihexyl-7-(5-(p-tolyl)-2-thienyl)fluoren-2-yl)-5-(p-tolyl)thiophene and 2-(9,9-dihexyl-7-(5-(4-methoxyphenyl)-2-thienyl)fluoren-2-yl)-5-(4-methoxyphenyl)thiophene.    EXAMPLE - Tetrakis(triphenylphosphine)palladium (2.3 g) and 2N aqueous sodium carbonate solution (10 ml) were added to a mixed solution of 1-bromo-4-n-octyl benzene (25 g), 2-thiopheneboronic acid (10.8 g) and tetrahydrofuran (100 ml) under nitrogen atmosphere, and the mixture was refluxed for 10 hours. After completion of the reaction, the mixture was worked up to give 2-(4-octyl-phenyl)-thiophene. N-Bromosuccinimide (17.5 g) was added to a solution of 2-(4-octyl-phenyl)-thiophene (26.2 g) dissolved in N,N-dimethylformamide (100 ml), and the mixture was stirred for 18 hours. After the completion of the reaction, the mixture was worked up to give 2-bromo-5-(4-octyl-phenyl)-thiophene. Then, tetrakis(triphenylphosphine)palladium (2.3 g) and 2N aqueous sodium carbonate solution (5 ml) were added to a mixed solution of 2-bromo-5-(4-octyl-phenyl)-thiophene (5.49 g), 9,9-dihexylfluorene-2,7-diboronic acid (3 g) and tetrahydrofuran (100 ml), and the mixture was refluxed for 8 hours. After completion of the reaction, the mixture was worked up to give 2-(9,9-dihexyl-7-(5-(4-octylphenyl)-2-thienyl)fluoren-2-yl)-5-(4-octylphenyl)thiophene (2.5 g).