Tetraaryl benzidines

A compound, represented by any one of the following formulae (I) to (V):

• ##STR59## wherein R.sub.11 and R.sub.12 may be the same or different and each represent a hydrogen atom, a lower alkyl group, a lower alkoxy group, an unsubstituted phenyl group, or a phenyl group having a lower alkyl group or a lower alkoxy group as a substituent(s), with the proviso that at least one of R.sub.11 and R.sub.12 is a phenyl group, or a phenyl group having a lower alkyl group or a lower alkoxy group;
• and R.sub.13 represents a hydrogen atom, a lower alkyl group, a lower alkoxy group or a chlorine atom;
• ##STR60## wherein R.sub.21, R.sub.22 and R.sub.23 may be the same or different and each represent a hydrogen atom, a lower alkyl group, a lower alkoxy group, an unsubstituted phenyl group, or a phenyl group having a lower alkyl group or a lower alkoxy group as a substituent(s);
• R.sub.24 represents a hydrogen atom, a lower alkyl group, a lower alkoxy group or a chlorine atom;
• and A.sub.1 represents a group represented by any one of the following structural formulae (a1) to (i1):
• ##STR61## in which R.sub.25 represents a hydrogen atom, a lower alkyl group, a lower alkoxy group or a chlorine atom;
• ##STR62## wherein R.sub.31, R.sub.32 and R.sub.33 may be the same or different and each represent a hydrogen atom, a lower alkyl group, or a lower alkoxy group, an unsubstituted phenyl group, or a phenyl group having a lower alkyl group or a lower alkoxy group as a substituent(s);
• R.sub.34 represents a hydrogen atom, a lower alkyl group, a lower alkoxy group or a chlorine atom;
• and A.sub.2 represents a group represented by any one of the following formulae (j1) to (n1):
• ##STR63## wherein R.sub.41 and R.sub.42 may be the same or different and each represent a hydrogen atom, a lower alkyl group, or a lower alkoxy group, an unsubstituted phenyl group, or a phenyl group having a lower alkyl group or a lower alkoxy group as a substituent(s);
• R.sub.43 represents a hydrogen atom, a lower alkyl group, a lower alkoxy group or a chlorine atom;
• and A.sub.3 represents a group represented by any one of the following structural formulae (a2) to (i2):
• ##STR64## in which R.sub.44 represents a hydrogen atom, a lower alkyl group, a lower alkoxy group or a chlorine atom;
• ##STR65## wherein R.sub.51 and R.sub.52 may be the same or different and each represent a hydrogen atom, a lower alkyl group, or a lower alkoxy group, an unsubstituted phenyl group or a phenyl group having a lower alkyl group or a lower alkoxy group as a substituent(s);
• R.sub.53 represents a hydrogen atom, a lower alkyl group, a lower alkoxy group or a chlorine atom;
• and A.sub.4 represents a group represented by any one of the following structural formulae (j2) to (n2):
• ##STR66##