Azo compound and process of producing the same, and novel compound and process of producing azo compounds using the same

A compound represented by the following formula (I):

• wherein R1′ represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group, a heterocyclic group or an acyl group, wherein each group may have a substituent;
• R2′ represents a halogen atom or a cyano group;
• R3′ represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an aryl group, a heterocyclic group, a carboxyl group or a sulfo group, wherein each group may have a substituent;
• R4′, R5′, R6′, and R7′ each independently represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an aryl group, a heterocyclic group, a sulfonyl group, an acyl group, a carboxyl group, a sulfo group or a carbamoyl group, wherein each group may have a substituent, provided that at least one of R4′ and R5′ represents a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group and that at least one of R6′ and R7′ represents a substituted or unsubstituted aryl group or a substituted or unsubstituted heterocyclic group;
• and A1′ and A2′ each represent —CR═ or a nitrogen atom provided that A1 and A2 do not simultaneously represent a nitrogen atom wherein R represents a hydrogen atom or a substituent.