TECHNOLOGY FOCUS - IMAGING AND COMMUNICATION - Preferred Photoreceptor: A photoreceptor (10) is obtained by forming a photoreceptor layer (14) on an electroconductive base (12). The photoreceptor layer contains the triaryl amine derivative.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): A dihaloethane is reacted with triethyl phosphorus acid, and the product is reacted with a benzaldehyde derivative in the presence of a catalyst, to obtain a halogenated phenyl vinyl benzene compound of formula (a). A halogenated benzaldehyde compound of formula (b) is reacted with a diphenyl hydrazine hydrochloride of formula (c), to obtain a halogenated diphenyl hydrazone derivative of formula (d). The hydrazone derivative is coupled with an aniline derivative in the presence of catalyst, to obtain an aniline benzaldehyde diphenyl hydrazone derivative of formula (e). Derivative (e) is coupled with compound (a) in the presence of catalyst, to obtain the new triarylamine derivative.X2,X3=halogen;andR1-R3=as mentioned above. SPECIFIC COMPOUNDS - Bis((2,6-dimethyl-phenyl)-(4-(diphenyl-hydrazonomethyl)-phenyl)-phenyl-amine) ethylene of formula (A), bis((2,6-dimethyl-phenyl)-(3-(diphenyl-hydrazonomethyl)-phenyl)-phenyl-amine) ethylene, and bis((4-(diphenyl-hydrazonomethyl)-phenyl)-(4-isopropyl-phenyl)-phenyl-amine) ethylene are disclosed as the triarylamine derivative.    EXAMPLE - Dichloroethane (in g) (9.6) and triethyl phosphorus acid (60) were stirred in a flask for 8 hours, heating at 180degreesC, and then cooled to room temperature. Excess triethyl phosphate was distilled, to obtain a phosphorus ester (27) with a yield of 90%. The ester (15), tetrahydrofuran (100 mL), and 28% sodium methoxide (19.3) were stirred at 0degreesC for 30 minutes. The reaction liquid was dissolved in dry tetrahydrofuran (300 mL), and bromobenzaldehyde (18.5) was added and stirred at room temperature for 12 hours. The reaction liquid was poured into ion-exchange water and extracted with toluene. The organic layer was washed 5 times with ion-exchange water and dried. The solvent was distilled off and the residue was purified with toluene/methanol mixed solvent, to obtain 1-bromo-4-((E)-2-(4-bromophenyl) vinyl) benzene (14.1) with a yield of 85%. Chlorobenzaldehyde (13.6), toluene (100 mL), and diphenyl hydrazine hydrochloride (21.5) were stirred at 120degreesC for 2 hours. Activated clay was added to the reaction liquid and filtration was carried out. Toluene was distilled off and the residue was purified with chloroform/hexane, to obtain chlorobenzaldehyde diphenyl hydrazone (26.9) with a yield of 85%. The hydrazone compound (11.4), bicyclohexyl biphenyl phosphine (0.066), palladium bis (dibenzylidene acetone) (0.086), t-sodium butoxide (7.68), dimethyl aniline (4.5), and xylene (500 mL) were stirred for 5 hours, heating at 120degreesC. The reaction solution was cooled to room temperature. The organic layer was washed thrice with ion-exchange water and dried. Xylene was distilled off and the residue was purified with chloroform/hexane, to obtain (2,6-dimethyl-phenyl)-(4-(diphenyl hydrazonomethyl)-phenyl)-amine (12.3), with a yield of 85%. The amine compound (14), bicyclohexyl biphenyl phosphine (0.032), palladium bis (dibenzylidene acetone) (0.04), t-sodium butoxide (5.76), 1-bromo-4-((E)-2-(4-bromophenyl) vinyl) benzene, and xylene (200 mL) were stirred for 3 hours, heating at 120degreesC, and then cooled to room temperature. The organic layer was washed thrice with ion-exchange water. Xylene was distilled off and the residue was purified with chloroform/hexane, to obtain bis((2,6-dimethyl-phenyl)-(4-(diphenyl-hydrazonomethyl)-phenyl)-phenyl-amine) ethylene (13.8) of formula (A) with a yield of 80%. An electrophotographic photoreceptor obtained using the triarylamine compound had excellent sensitivity and enabled high-speed formation of images.