TECHNOLOGY FOCUS - IMAGING AND COMMUNICATION - Preferred Layer: An electrophotographic photoreceptor (1) has photoreceptor layer containing binder resin and charge-transport agent, on electroconductive substrate. The charge-transport agent consists of triarylamine derivative.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): The halogenated-aryl derivative and amine derivative, are reacted to obtain triarylamine derivative. Preferred Substituent: At least one substituent is substituted by ortho position with respect to nitrogen atom. SPECIFIC COMPOUNDS - 17 triarylamine derivatives are disclosed, such as phenyl-(6-((E)-2-(4-(phenyl-(2,4,6-trimethyl-phenyl)-amino)-phenyl)-vinyl)-naphthalen-2-yl)-(2,4,5-trimethyl-phenyl)-amine, phenyl-(4'-((E)-2-(4-(phenyl-(2,4,6-trimethyl-phenyl)-amino)-phenyl)-vinyl)-biphenyl-4-yl)-(2,4,5-trimethyl-phenyl)-amine, phenyl-(4'-((E)-2-(4-(phenyl-p-tolyl-amino)-phenyl)-vinyl)-biphenyl-4-yl)-p-tolyl-amine, phenyl-(6-((E)-2-(4-(phenyl-(2,4,6-trimethyl-phenyl)-amino)-phenyl)-vinyl)-pyridin-3-yl)-(2,4,6-trimethyl-phenyl)-amine and (4-isopropyl-phenyl)-(5-((E)-2-(4-((4-isopropyl-phenyl)-phenyl-amino)-phenyl)-vinyl)-thiophen-2-yl)-phenyl-amine.    EXAMPLE - 2-chloro-6-methyl-naphthalene (in g) (120) and phosphorus acid triethyl (113) were reacted at 150degrees C for 2 hours, cooled and phosphorus-acid triethyl was distilled. The resulting residue is purified, to obtain white crystals of phosphorus-containing naphthalene compound. Then, the resulting compound was stirred in chlorobenzaldihyde (11.3) for 12 hours, to obtain reaction liquid. The reaction liquid was processed and purified, to obtain white crystals of 2-chloro-6-((E)-2-(4-chloro-phenyl)-vinyl)-naphthalene (15.9). The obtained 2-chloro-6-((E)-2-(4-chloro-phenyl)-vinyl)-naphthalene (12) was reacted with phenyl-(2,4,6-trimethyl-phenyl)-amine (16.9), to obtain yellow crystals of phenyl-(6-((E)-2-(4-(phenyl-(2,4,6-trimethyl-phenyl)-amino)-phenyl)-vinyl)-naphthalen-2-yl)-(2,4,5-trimethyl-phenyl)-amine (17.7) with yield of 68%.