TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): A benzofuran-type compound of formula (II) is reacted with nitro group-containing compound of formula (III), to obtain nitro group-containing of formula (IV). The obtained compound (IV) is subjected to coupling reaction, to obtain nitrogen-containing aromatic compound. SPECIFIC COMPOUNDS - 75 Nitrogen-containing compounds e.g. 8-(3-phenylphenyl)-10-(3-(10-(3-phenylphenyl)-8,10-diazatetracyclo(7.7.0.02,7.011,16)hexadeca-1(9),2(7),3,5,11(16),12,14-heptaen-8-yl)phenyl)-8,10-diazatetracyclo(7.7.0.02,7.011,16)hexadeca-1(9),2(7),3,5,11(16),12,14-heptaene of formula (Ia), 8-phenyl-10-(3-(10-phenyl-8,10-diazatetracyclo(7.7.0.02,7.011)hexadeca-1(9),2(7),3,5,11(16),12,14-heptaen-8-yl)phenyl)-8,10-diazatetracyclo(7.7.0.02,7.011,16)hexadeca-1(9),2(7),3,5,11(16),12,14-heptaene, 8-(2-phenylphenyl)-10-(3-(10-(2-phenylphenyl)-8,10-diazatetracyclo(7.7.0.02,7.011,16)hexadeca-1(9),2(7),3,5,11(16),12,14-heptaen-8-yl)phenyl)-8,10-diazatetracyclo(7.7.0.02,7.011,16)hexadeca-1(9),2(7),3,5,11(16),12,14-heptaene, 8-phenyl-10-(4-(10-phenyl-8,10-diazatetracyclo(7.7.0.02,7.011,16)hexadeca-1(9),2(7),3,5,11(16),12,14-heptaen-8-yl)phenyl)-8,10-diazatetracyclo(7.7.0.02,7.011,16)hexadeca-1(9),2(7),3,5,11(16),12,14-heptaene and 8-(naphthalen-2-yl)-10-(4-(10-(naphthalen-2-yl)-8,10-diazatetracyclo(7.7.0.02,7.011,16)hexadeca-1(9),2(7),3,5,11(16),12,14-heptaen-8-yl)phenyl)-8,10-diazatetracyclo(7.7.0.02,7.011,16)hexadeca-1(9),2(7),3,5,11(16),12,14-heptaene re disclosed.    EXAMPLE - (In g) 5-biphenyl-3-yl-5,6-dihydro-indolo( 2,3-b)indole (2.5), 1,3-diiodobenzene (1.2) were reacted under nitrogen atmosphere, stirred for 4 hours, and copper iodide (0.34), potassium phosphate (11.3), trans-1,2-cyclohexane diamine (2) and 1,4-dioxane (100 ml) were added, heated at 120 degrees C, filtered, dried and purified, to obtain 8-(3-phenylphenyl)-10-(3-(10-(3-phenylphenyl)-8,10-diazatetracyclo(7.7.0.02,7.011,16)hexadeca-1(9),2(7),3,5,11(16),12,14-heptaen-8-yl)phenyl)-8,10-diazatetracyclo(7.7.0.02,7.011,16)hexadeca-1(9),2(7),3,5,11(16),12,14-heptaene.