TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): Preparation of (I) comprises subjecting a metal catalyst cross coupling reaction of X1 substituted (hetero)aryl dihalo compound with further (hetero)aryl compound optionally substituted with A; and forming a bivalent bridge X between the coupled (hetero)aryl compound.X1 = X. Preferred Definitions:    Y1 = N or C=O;    Z = CR;    Ar1 = phenyl, naphthyl, substituted 5-15C-(hetero)aryl ring system, or (hetero)aryl substituted with aryl amine or carbazole;    E = a single bond or C(R1)2; and    t = 0.    SPECIFIC COMPOUNDS - 5 Compounds (I) are disclosed e.g. 6,6,12,12-tetramethyl-3,4,6,12-tetrahydro-indeno(1,2-b)fluorene compound of formula (Ia), 12,12-dimethyl-2,2,9,9-tetraphenyl-12H-6-thia-indeno(1,2-b)fluorene-2,9-diamine, 6,6,12,12-tetramethyl-N,N,N',N'-tetra-p-tolyl-6H,12H-indeno(1,2-b)fluorene-2,8-diamine, (8-benzoyl-6,12-diphenyl-6,12-dihydro-6,12-diaza-indeno(1,2-b)fluoren-2-yl)-phenyl-methanone, and (9-benzoyl-6,12-diphenyl-6,12-dihydro-6,12-diaza-indeno(1,2-b)fluoren-3-yl)-phenyl-methanone.    EXAMPLE - A solution of indenodibenzothiophene (95.3 g) in dichloromethane (2.5 l) was cooled at 5 degrees C under inert gas. Subsequently bromine (38.4 ml) was dissolved in chloroform (250 ml) and stirred. The mixture was transferred with sodium sulfate solution and the phases were separated, and the solvent was removed to obtain 2,9-dibromo-12,12-dimethyl-12H-6-thia-indeno(1,2-b)fluorene (98%). A degassed solution of 2,9-dibromo-12,12-dimethyl-12H-6-thia-indeno(1,2-b)fluorene (19.2 g) and diphenylamine (26 g) in dioxane (1000 ml) was saturated with nitrogen for 1 hour. The solution was transferred first with tri-tert-butyl phosphine (0.97 ml), and then with palladium acetate (0.47 g). Subsequently sodium tert-butoxide (12 g) was added. The reaction mixture was heated for 18 hours under reflux, cooled and water (1000 ml) was added. The organic phase was washed with water (200 ml), dried over magnesium sulfate and the solvents were removed to obtain 12,12-dimethyl-2,2,9,9-tetraphenyl-12H-6-thia-indeno(1,2-b)fluorene-2,9-diamine (25 g).