Hydroxynaphthalenedicarboxylic acid hydrazide dimer and derivatives thereof as well as process for preparing them

A hydroxynaphthalenedicarboxylic acid hydrazide dimer or a derivative thereof represented by formula (1):

• wherein X1 and X2 are independently selected from the group consisting of carboxyl group, a group represented by formula (2) and a group represented by formula (3):
• —CO—NH-Z (2)
• —CO—NHNH2 (3)
• wherein Z is a group selected from the group consisting of an optionally branched, optionally substituted, saturated or unsaturated aliphatic group having 1-20 carbon atoms, an optionally substituted aromatic group and an optionally substituted heterocyclic group having conjugated double bonds;
• Y1 and Y2 are independently selected from the group consisting of carboxyl group, carbamoyl group, a group represented by formula (2), a group represented by formula (3) and a group represented by formula (4):
• —CO—O-A (4)
• wherein A is alkyl group having 1-6 carbon atoms;
• provided that at least one of X1, X2, Y1 and Y2 in formula (1) is a group represented by formula (3);
• R1 and R2 are independently selected from the group consisting of hydrogen atom, an optionally branched alkyl group having 1-20 carbon atoms which may be optionally substituted with hydroxyl group and/or halogen atom and aralkyl group having 7-11 carbon atoms;
• Q1 and Q2 are independently selected from the group consisting of alkyl group having 1-6 carbon atoms, alkoxy group having 1-6 carbon atoms, halogen atom, nitro group and hydroxyl group;
• m and n represent integers of 0-4;
• provided that when m or n is from 2 to 4, each of the Q1s and the Q2s may be the same or different.