O[C:2]1[C:11](O)=[CH:10][C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[CH:3]=1.[CH3:13][C:14]1[C:19]([CH3:20])=[CH:18][C:17]([NH2:21])=[C:16]([NH2:22])[CH:15]=1.CN(C)C1C=CC=CC=1.C(Cl)Cl>C1(C)C=CC=CC=1.CCCCCCC>[CH3:13][C:14]1[C:19]([CH3:20])=[CH:18][C:17]2[NH:21][C:2]3[CH:3]=[C:4]4[CH:5]=[CH:6][CH:7]=[CH:8][C:9]4=[CH:10][C:11]=3[NH:22][C:16]=2[CH:15]=12,3-dihydroxynapthalene (10 g, 62.5 mmol), 4,5-dimethyl-1,2-phenylenediamine (8.5 g, 62.5 mmol) and N,N-dimethylaniline (54 ml) are placed into a round bottom flask under nitrogen atmosphere. Mixture is stirred at reflux. Reaction is monitored by TLC (CH2Cl2:Heptane/1:1) until all 2,3-dihydroxynaphthalene has reacted (˜3 hours). After cooling to room temperature, toluene (100 ml) is added and solid is collected by vacuum filtration. After washing with toluene (50 ml), ethanol (100 ml) and hexanes (50 ml), the product is dried under vacuum to yield 23.3 g (33% yield) of light yellow solid.
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