TECHNOLOGY FOCUS - IMAGING AND COMMUNICATION - Preferred Apparatus: An electrophotographic photoreceptor (1) is equipped with a photoreceptor layer containing binder resin and charge-transport agent containing the arylamine derivative, on an electroconductive substrate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): Triethyl phosphate is reacted with phenyl compound of formula (1a), to obtain diphosphate derivative of formula (3a). The obtained diphosphate derivative is reacted with aldehyde to obtain halogenated phenyl derivative of formula (5a). The halogenated phenyl derivative is reacted with amine derivative to obtain halogenated phenylamine derivative of formula (7a). The halogenated phenylamine derivative is then reacted with an aldehyde to obtain the new arylamine derivative.R1-R3=same as defined above;andX=R1. Preferred Definitions:    R1=aryl group having substituent in the ortho-position with respect to nitrogen atom.    SPECIFIC COMPOUNDS - 18 arylamine derivatives are disclosed. E.g. (3,4-bis-((E)-styryl)-phenyl)-(2,2-diphenyl-vinyl)-(2,4,6-trimethyl-phenyl)-amine of formula (A), (2,6-dimethyl-phenyl)-(2,2-diphenyl-vinyl)-(3-((E)-styryl)-4-((E)-2-p-tolyl-vinyl)-phenyl)-amine, (3,4-bis-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-(4-ethyl-2-methyl-phenyl)-((Z)-2-phenyl-propenyl)-amine, (2,3-bis-((E)-styryl)-phenyl)-(2,2-diphenyl-vinyl)-phenyl-amine, and (2,3-bis-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-((Z)-2-phenyl-propenyl)-o-tolyl-amine.    EXAMPLE - 4-chloro-1,2-dimethyl-benzene (in g) (85) and triethyl phosphate (0.97 mol) were reacted at 150 degrees C for 2 hours, cooled, and excess triethyl phosphate was depressurizingly distilled. Then, crystallization refinement of the residue was carried out, and 4-chloro-1,2-dimethyl-benzene derivative (colorless oily substance) with yield of 84.7% was obtained. Subsequently, the obtained 4-chloro-1,2-dimethyl-benzene derivative (40), dried tetrahydrofuran (150 mL), and 28% sodium methoxide (44.9) were stirred for 30 minutes. Then, benzaldehyde (21.6) dissolved in dried tetrahydrofuran (100 mL) was added and stirred for 12 hours. The obtained reaction liquid was poured into ion-exchange water. The organic layer was washed with ion-exchange water and dried, and solvent was distilled. The obtained residue was purified using toluene/methanol (100 ml/200 ml) to obtain white crystals of 4-chloro-1,2-bis-((E)-styryl)-benzene with yield of 73.5%. Then, obtained white crystals of 4-chloro-1,2-bis-((E)-styryl)-benzene (15.5), 2-(di-cyclohexyl phosphino) biphenyl (0.041), tris di-benzylideneacetone dipalladium (0.053), t-sodium butoxide (3.36), 2,4,6-trimethyl-phenylamine (6.3), and ortho xylene (150 ml) were stirred under argon atmosphere at 120 degrees C for 3 hours and cooled. The organic layer was washed with ion-exchange water and dried, and xylene was depressurizingly distilled. The residue was purified to obtain (3,4-bis-((E)-styryl-phenyl)-(2,4,6-trimethyl phenyl)-amine with yield of 80.6%. The obtained (3,4-bis-((E)-styryl)-phenyl)-(2,4,6-trimethyl-phenyl)-amine (12.4), diphenylacetaldehyde (6.44), toluene (100 ml), and one drop of sulfuric acid were stirred for 2 hours, refluxed, and cooled. The organic layer was water-washed and dried, and xylene was depressurizingly distilled. The obtained residue was purified using chloroform/hexane to obtain pale-yellow crystals of 3,4-bis-(E)-styryl)-phenyl)-(2,2-diphenyl-vinyl)-(2,4,6-trimethyl-phenyl)-amine. An electrophotographic photoreceptor formed using the obtained compound had excellent sensitivity.