The new hydrazone cpds. have formula (I), where R1, R2, R3, R4 = alkyl or aryl.    Cpd. (1) is used as charge transport material in an electrophotographic photoreceptor which comprises a conductive base and a photosensitive layer contg. a charge transporting material, a charge generation material and binder resin.    A carrier generation material used with cpd. (1) is, e.g., Se-Te, amorphous Si, azo-type cpds., phthalocyanine-type cpds. or triphenylmethane-type cpds. Binder used with the azo pigment is, e.g., polycarbonates, polystyrenes or epoxy resin.    USE/ADVANTAGE -   Cpd. (1) is useful for an electrophotographic photoreceptor, organic solar battery, EL element, etc. It has good charge transporting ability and good chemical stability. The photoreceptor using cpd. (1) has high sensitivity and good charging characteristics and repeat characteristics.    In an example, in the synthesis of cpd. of formula (Ia), 3.75 g cpd. of formula (C1) which had been pre-synthesised was dissolved in 100ml THF. To the soln. obtd. were added dropwise 1.38 g toluene soln. of 70% sodium.bis(2-methoxy)aluminium hydride at 5 deg.C over 10 mins. The mixed soln. was stirred at 5 deg.C for 5 hrs. 50 ml aq. 30% H2SO4 soln. was added dropwise. The reaction mixt. was reacted for 15 hrs. and then was neutralised with aq. 40% NaOH soln. and extracted from benzene to obtain pale yellow crystals of formula (D1), 1.97g, yield 52.2%. 1.89g cpd. of formula (D1) and 1.10g cpd. of formula (E1) were dissolved in 100ml ethanol. The soln. was treated with a small amt. of acetic acid and the mixt. was heated under reflux for 3 hrs. The reaction mixt. was treated with water and filtered. The obtd. deposits were washed with n-hexane to obtain yellow crystals, 0.914g, yield 41.5%. The crystals were assigned to cpd. of formula (Ia) by mass spectroscopy and an elemental analysis. Mass spectrum: 541. Elemental analysis: C40H32N2. Calculated(%): C = 88.85, H = 5.97, N = 5.18. Found(%): C = 88.81, H = 6.13, N = 5.06.