TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): An amine-containing compound is reacted with aryl-containing compound, to obtain diamine derivative (I). SPECIFIC COMPOUNDS - 4 Diamine derivatives e.g. N,N,N'-triphenyl-N'-(4-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-benzene-1,3-diamine of formula (II), N-(4-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-N,N',N'-tris-(4-((E)-styryl)-phenyl)-benzene-1,3-diamine, N-(4-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-N'-(4-((E)-styryl)-phenyl)-N,N'-di-p-tolyl-benzene-1,3-diamine and N-(4-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-N'-(4-((E)-styryl)-phenyl)-N'-p-tolyl-N-(4-((E)-2-p-tolyl-vinyl)-phenyl)-benzene-1,3-diamine are disclosed.    EXAMPLE - Bromo-benzene (in g) (9.5), (2-biphenyl) di-cyclohexyl phosphine (0.0921), tris (dibenzylidene acetone) dipalladium (0.1203), sodium-t-butoxide (9), N-(4-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-benzene-1,3-diamine (6.2) and distilled ortho xylene (500 ml) are added into a flask and argon gas substitution was carried out after which stirring and heating at 120 degrees C was performed, to obtain a reaction liquid (organic layer) which was washed using ion-exchange water. The resultant organic layer was then subjected to adsorption treatment using anhydrous sodium sulfate and activated clay, cooled to room temperature and dried. Then, xylene was depressurizingly distilled and residue was purified, to obtain yellow crystals of N,N,N'-triphenyl-N'-(4-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-benzene-1,3-diamine (8.6) in yield of 705%, excellent in sensitivity, solubility with respect to solvent and compatibility with respect to binder resin. The obtained N,N,N'-triphenyl-N'-(4-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-benzene-1,3-diamine (60 mass parts), tetrahydrofuran (800 mass parts), X-type metal-less phthalocyanine (5 mass parts) and polycarbonate resin (100 mass parts) were mix-dispersed for 50 hours, to obtain coating liquid. The obtained coating liquid was then coated on electroconductive substrate and dried, to obtain a photoreceptor layer of monolayer-type electrophotographic photoreceptor.