TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (disclosed): A phenyl diamine derivative of formula (11) and hydrazine derivative of formula (9) are reacted, in the presence of palladium catalyst in xylene solvent, to obtain diphenyl benzidine derivative (1).R1-R3=defined above;andX3=halogen.Preferred Composition: An electrophotographic photoreceptor (10) has a photoreceptor layer (14) containing the diphenyl benzidine derivative, provided on an electroconductive base (12). SPECIFIC COMPOUNDS - Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-(diphenyl-hydrazonomethyl)-phenyl)-Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((E)-styryl)-phenyl)-biphenyl-4,4'-diamine, Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-(diphenyl-hydrazonomethyl)-phenyl)-3-methyl-Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((E)-2-p-tolyl-vinyl)-phenyl)-biphenyl-4,4'-diamine, Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-(diphenyl-hydrazonomethyl)-phenyl)-3,3'-dimethyl-Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((1E,3E)-4-phenyl-buta-1,3-dienyl)-phenyl)-biphenyl-4,4'-diamine and Nasterisk4asterisk,Nasterisk4'asterisk-Bis-(4-(diphenyl-hydrazonomethyl)-phenyl)-3,3'-dimethyl-Nasterisk4asterisk,Nasterisk4'asterisk-bis-(3-((1E,3E)-4-phenyl-bu ta-1,3-dienyl)-phenyl)-biphenyl-4,4'-diamine, are claimed as diphenyl benzidine derivative (1).    EXAMPLE - 4-chlorobenzaldehyde (in g) (13.6), N,N-diphenyl-hydrazine hydrochloride (21.5) and toluene (100 ml), were stirred at 120degreesC for 2 hours. Activated clay was added to reaction liquid, and filtration processing was performed. The resulting residue was purified using chloroform/hexane, to obtain N'-(1-(4-chloro-phenyl)-meth-(E)-ylidene)-N,N-diphenyl-hydrazine (26.9). 1-chloro-4-((E)-styryl)-benzene (16.2), bicyclo hexyl biphenyl phosphine (0.066), palladium bis (dibenzylidene acetone) (0.086), t-sodium butaoxide (7.68), biphenyl-4,4'-diamine (14.7) and xylene (500 ml), were stirred at 120degreesC for 5 hours in argon atmosphere. The reaction solution was cooled to room temperature. The resulting organic layer was washed 3 times with ion exchange water, and dried using anhydrous sodium sulfate and activated clay. The resulting residue was purified using chloroform/hexane, to obtain Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((E)-styryl)-phenyl)-biphenyl-4,4'-diamine (17). The obtained N'-(1-(4-chloro-phenyl)-meth-(E)-ylidene)-N,N-diphenyl-hydrazine (11), bicyclo hexyl biphenyl phosphine (0.032), palladium bis (dibenzylidene acetone) (0.04), t-sodium butaoxide (5.76), the obtained Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((E)-styryl)-phenyl)-biphenyl-4,4'-diamine (9.7) and xylene (200 ml), were stirred at 120degreesC for 3 hours in argon atmosphere. The reaction solution was cooled to room temperature. The resulting organic layer was washed 3 times with ion exchange water, and dried using anhydrous sodium sulfate and activated clay. The resulting residue was purified using chloroform/hexane, to obtain Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-(diphenyl-hydrazonomethyl)-phenyl)-Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((E)-styryl)-phenyl)-biphenyl-4,4'-diamine of formula (1-1). The obtained Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-(diphenyl-hydrazonomethyl)-phenyl)-Nasterisk4asterisk,Nasterisk4'asterisk-bis-(4-((E)-styryl)-phenyl)-biphenyl-4,4'-diamine had yield of 80%.