cyclopentadiene derivative compounds and electrophotographic photoconductor comprising one cyclopentadiene derivative compound

An electrophotographic photoconductor comprising an electroconductive support and a photoconductive layer formed thereon comprising at least one cyclopentadiene derivative compound represented by a formula:

• ##STR477## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently represent a hydrogen atom, a halogen atom, a cyano group, a nitro group, or an alkyl group which may have a substituent,
• wherein X represents:
• a substitution group of a formula .dbd.C--›A!›B! wherein A and B independently represent a halogen atom, a cyano group, an aromatic group which may have a substituent, or a group --COOR.sub.6 wherein R.sub.6 represents an alkyl group which may have a substituent, or an aromatic group which may have a substituent;
• or
• a substitution group of a formula .dbd.N--R.sub.5 where R.sub.5 represents a cyano group, an alkyl group which may have a substituent, or an aromatic group which may have a substituent.