1-Ethyl-2-methyl-1H-benzo[G]indole → 3-(1-ethyl-2-methylindol-3-yl)-3-(1-ethyl-2-methyl-1H-benz[g]indol-3-yl)-4,5,6,7-tetrachlorophthalide

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A solution of about 4.5 grams of 1-ethyl-2-methyl-3-(2-carboxy-3,4,5,6-tetrachlorobenzoyl)indole and about 3.2 grams of 1-ethyl-2-methyl-1H-benz[g]indole in 50 milliliters of acetic anhydride is heated at 90° C. for about four hours. The product is isolated as disclosed previously. 2.0 grams of the title compound is obtained having a melting point of 170°-177° C. A solution of the product imparts a purple color to paper coated with a phenolic resin or silton clay or a combination of the two. The calculated analysis for C34H26N2Cl4O2, the title compound, is C, 64.17%; H, 4.12%; N, 4.40%; and Cl, 22.28%. Found, on analysis: C, 64.33%; H, 4.19%; N, 4.49%; Cl, 22.37%.

Provenance & Evidence