TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): Preparation of (I) involves coupling of diarylamine of formula (i) with dihalogenated compound of formula (ii) in presence of a copper catalyst.G=Br or I. SPECIFIC COMPOUNDS - 25 Compounds are disclosed as (I) e.g. 4-(4-((9-methyl-6-((4-(3-oxo-butyl)-phenyl)-phenyl-amino)-9H-carbazol-3-yl)-phenyl-amino)-phenyl)-butan-2-one (I'); 4-(4-((9-methyl-6-((4-(3-oxo-butyl)-phenyl)-(4-thiophen-2-yl-phenyl)-amino)-9H-carbazol-3-yl)-(4-thiophen-2-yl-phenyl)-amino)-phenyl)-butan-2-one; 4-(4-((6-((4-(3-oxo-butyl)-phenyl)-phenyl-amino)-9-phenyl-9H-carbazol-3-yl)-phenyl-amino)-phenyl)-butan-2-one; 4-(4-((9-(2,6-dimethyl-phenyl)-6-((4-(3-oxo-butyl)-phenyl)-phenyl-amino)-9H-carbazol-3-yl)-phenyl-amino)-phenyl)-butan-2-one; and 4-(4-(biphenyl-4-yl-(6-(biphenyl-4-yl-(4-(3-oxo-butyl)-phenyl)-amino)-9-(2,6-dimethyl-phenyl)-9H-carbazol-3-yl)-amino)-phenyl)-butan-2-one.    EXAMPLE - Acetoanilide (25 g), methyl 4-iodophenylpropionate (64.4 g), potassium carbonate (38.3 g), copper sulfate pentahydride (2.3 g), and n-tridecane (50 ml) were heated and stirred under nitrogen gas flow at 230 degrees C for 20 hours. Potassium hydroxide (15.6 g) dissolved in ethylene glycol (300 ml) was then added and the solution refluxed under nitrogen gas flow for 3.5 hours. After workup the resultant was recrystallized from hexane to yield 36.5 g of 3-(4-phenylaminophenyl)-propionic acid methyl ester (DAA-1). Next, a mixed solution of 9-hexylcarbazole (7.06 g), potassium iodate (2.40 g), iodine (7.72 g), and acetic acid (280 ml) was heated to 80 degrees C. Furthermore, 20% sulfuric acid (20 ml) was added and the solution stirred at 80 degrees C. for 7 hours. After workup 3,6-diiodo-9-hexylcarbazole (7.8 g) was obtained. Under a nitrogen atmosphere, a mixed solution of 3,6-diiodo-9-hexylcarbazole (1.36 g), DAA-1 (1.66 g), copper(II) sulfate pentahydrate (0.135 g), potassium carbonate (1.27 g) and 1,2-dichlorobenzene was stirred at 180 degrees C. for 30 hours. 1,2-Dichlorobenzene was distilled off and after workup, 4-(4-((9-methyl-6-((4-(3-oxo-butyl)-phenyl)-phenyl-amino)-9H-carbazol-3-yl)-phenyl-amino)-phenyl)-butan-2-one (1.22 g) was obtained.