| abstract |
A 5H-dibenzo [a,d] cycloheptenylidene derivative and a 5H-dibenzo [1,d] cycloheptenylidene derivative represented by the following general formula [I]: <IMAGE> [I] wherein X is -CH2-CH2- or -CH=CH-; R1 and R2 are alkyl groups, aralkyl groups, aromatic groups or heterocyclic groups, R3 and R4 are hydrogen atoms, alkyl groups, alkoxy groups or halogen atoms; and Ar1 is an aromatic group or a heterocyclic group, process for producing those derivatives, and electrophotographic photosensitive member using the same. |