TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (claimed): Preparation of (I) comprises:(i) synthesizing (I; Ar1= H);(ii) halogenating (I; Ar1= H) to give (I; Ar1= halo); and(iii) reacting (I; Ar1= halo) with boronic acid compounds of formula (Ar1-B(OR) 2) in a metal organic coupling reaction to give (I). Preferred Definitions:    Ar1=benzene, naphthalene, anthracene, phenanthrene, pyrene, dihydropyrene, chrysene, perylene, fluoranthene, benzanthracene, tetracene, pentacene, benzopyrene, furan, benzofuran, isobenzofuran, dibenzofuran, thiophene, benzothiophene, isobenzothiophene, dibenzothiophene, pyrrole, indole, isoindole, carbazole, pyridine, quinoline, isoquinoline, acridine, phenanthridine, benzo-5,6-quinoline, benzo-6,7-quinoline, benzo-7,8-quinoline, phenothiazine, phenoxazine, pyrazole, indazole, imidazole, benzimidazole, naphthimidazole, phenanthrimidazole, pyridimidazole, pyrazinimidazole, quinoxalinimidazole, oxazole, benzoxazole, naphthoxazole, anthroxazole, phenanthroxazole, isoxazole, 1,2-thiazole, 1,3-thiazole, benzothiazole, pyridazine, benzopyridazine, pyrimidine, benzopyrimidine, quinoxaline, pyrazine, phenazine, naphthyridine, azacarbazole, benzocarboline, phenanthroline, 1,2,3-triazole, 1,2,4-triazole, benzotriazole, 1,2,3-oxadiazole, 1,2,4-oxadiazole, 1,2,5-oxadiazole, 1,3,4-oxadiazole, 1,2,3-thiadiazole, 1,2,4-thiadiazole, 1,2,5-thiadiazole, 1,3,4-thiadiazole, 1,3,5-triazine, 1,2,4-triazine, 1,2,3-triazine, tetrazole, 1,2,4,5-tetrazine, 1,2,3,4-tetrazine, 1,2,3,5-tetrazine, purine, pteridine, indolizine, benzothiadiazole, indenocarbazole, fluorene, indenofluorene, spirobifluorene or indolocarbazole (all optionally substituted by one or more R); and    Y1=CH (preferred) or N (when Y1 is not bonded to X).    SPECIFIC COMPOUNDS - 129 Compounds (I) are disclosed e.g. 4,6,6,12,12-pentamethyl-6H,12H-indeno(1,2-b)fluoren-2,8-bis-(1-phenyl-1H-benzimidazole) of formula (Ia), 2,8-(5-methyl-2-thiophenyl)-4,6,6,12,12-pentamethyl-6,12-dihydro-indeno(1,2-b)fluorene, 2,8-bis(4,6-diphenyl-1,3,5-triazin-2-yl)-4,6,6,10,12,12-hexamethyl-6,12-dihydro-indeno(1,2-b)fluorene, 2,2'-(4,6,6,10,12,12-hexamethyl-6,12-dihydroindeno(1,2-b)fluorene-2,8-diyl)dithiophene and 2,2'-(5,6,11,11,12,12-hexamethyl-11,12-dihydroindeno(2,1-a)fluorene-2,9-diyl)dithiophene.    EXAMPLE - 4,6,6,12,12-Pentamethyl-6,12-dihydro-indeno(1,2-b)fluorene (100 mmole) was dissolved in dichloromethane (1000 ml), cooled to 10 degrees C and mixed with a solution of sodium carbonate (244 mmole) in water (750 ml). After addition of bromine (220 mmole), the suspension was stirred at 10 degrees C for 6 hours, filtered, and worked up to give 2,8-dibromo-4,6,6,12,12-pentamethyl-6,12-dihydro-indeno(1,2-b)fluorene. 2,8-Dibromo-4,6,6,12,12-pentamethyl-6,12-dihydro-indeno(1,2-b)fluorene (57 mmole) was dissolved in diethyl ether (500 ml) and cooled to 0 degrees C. Then n-butyl lithium (173 mmole) was added dropwise and stirred at 0 degrees C for 3 hours. Then dimethylformamide (173 mmole) was added dropwise and the reaction mixture was stirred at room temperature for 8 hours. The reaction mixture was partitioned between the water and toluene by the addition of 1 N hydrochloric acid (58 ml). The aqueous phase was extracted thrice with toluene and the combined organic phases were dried over sodium sulfate and concentrated to give 4,6,6,12,12-pentamethyl-6,12-dihydroindeno(1,2-b)fluorene-2,8-dicarbaldehyde. 4,6,6,12,12-pentamethyl-6,12-dihydroindeno(1,2-b)fluorene-2,8-dicarbaldehyde (36 mmole) was dissolved in dry dimethylformamide (140 ml), and N-phenyl-o-phenylenediamine (36 mmole) and potassium hydrogen monopersulfate (50.4 mmole) were added and stirred for 1 hour. The reaction mixture was slowly added to an aqueous potassium carbonate solution in small portions. The obtained solid was dissolved in ethyl acetate, washed several times with water and dried, and then recrystallized from toluene and acetonitrile to give 4,6,6,12,12-pentamethyl-6H,12H-indeno(1,2-b)fluoren-2,8-bis-(1-phenyl-1H-benzimidazole) (18 mmole, 50%).