TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No preparation method is given. Preferred Definitions:    At least one R1 and R1a = pyrrole, pyridine, pyrimidine, carbazole, imidazole, benzimidazole, imidazolobenzimidazole, triazole, benzotriazole, triazolopyridine, thiophene, benzothiophene, dibenzothiophene, furan, benzofuran, dibenzofuran, oxazole, benzoxazole, thiazole, benzothiazole or their substituted derivatives or deuterated analogs;    carbazole = carbazolyl moieties of formula (M1), (M2) or (M3);    R8 = alkyl, silyl, aryl or their deuterated analogs;    R9 = aryl or deuterated aryl;    dibenzothiphene = dibenzothiophenyl moieties of formula (M4) or (M5); and    dibenzofuran = dibenzofuranyl moieties of formula (M6) or (M7).    SPECIFIC COMPOUNDS - 63 Compounds (I) are disclosed e.g. N,N'-di(biphenyl-4-yl)-N,N'-bis(3-(3,6-diphenyl-9H-carbazol-9-yl)phenyl)-7,7-dimethyl-7H-benzo(c)fluorene-5,9-diamine of formula (Ia), Nasterisk5asterisk,Nasterisk9asterisk-bis-biphenyl-4-yl-Nasterisk5asterisk,Nasterisk9asterisk-bis-(3-carbazol-9-yl-phenyl)-7,7-dimethyl-7H-benzo(c)fluorene-5,9-diamine, Nasterisk5asterisk,Nasterisk9asterisk-bis-biphenyl-4-yl-Nasterisk5asterisk,Nasterisk9asterisk-bis-(3-(3,6-di-tert-butyl-carbazol-9-yl)-phenyl)-7,7-dimethyl-7H-benzo(c)fluorene-5,9-diamine, Nasterisk5asterisk,Nasterisk9asterisk-bis-(3-(3,6-di-tert-butyl-carbazol-9-yl)-phenyl)-7,7-dimethyl-Nasterisk5asterisk,Nasterisk9asterisk-bis-(4'-propyl-biphenyl-4-yl)-7H-benzo(c)fluorene-5,9-diamine and Nasterisk5asterisk,Nasterisk9asterisk-bis-(3-carbazol-9-yl-phenyl)-7,7-dimethyl-Nasterisk5asterisk,Nasterisk9asterisk-di-p-tolyl-7H-benzo(c)fluorene-5,9-diamine.    EXAMPLE - To a 500 ml round bottom flask under nitrogen were added 2.7 g 4-bromobiphenyl, 5 g 3-(3,6-diphenyl-9H-carbazol-9-yl)aniline, 212 mg tris(dibenzylideneacetone) dipalladium(0), 93.9 mg tri-tert-butylphosphine and 120 ml toluene. 1.23 g Sodium tert-butoxide was then added and the reaction stirred at room temperature overnight. The solvent was removed and the material was separated by column chromatography using silica gel and 1:2 chloroform in hexanes. To a 500 ml round bottom flask under nitrogen were added 1.93 g 5,9-dibromo-7,7-dimethyl-7H-benzo(c)fluorene, 5.68 g N-(3-(3,6-diphenyl-9H-carbazol-9-yl)phenyl)biphenyl-4-amine, 88 mg tris(dibenzylideneacetone) dipalladium(0), 38.9 mg tri-tert-butylphosphine and 100 ml toluene. 1.02g Sodium tert-butoxide was then added and the reaction stirred at 80 degrees C overnight. Solvent was removed and the resultant material was separated by column chromatography using silica gel and 2:3 chloroform in hexanes. Fractions were dried and recrystallized from 2:1dichloromethane and acetonitrile, to obtain N,N'-di(biphenyl-4-yl)-N,N'-bis(3-(3,6-diphenyl-9H-carbazol-9-yl)phenyl)-7,7-dimethyl-7H-benzo(c)fluorene-5,9-diamine (yield 61%).