Tetrachlorophthalic anhydride → 2-[(1-n-Octyl-2-methyl-3-indolyl)carbonyl]-3,4,5,6-tetrachlorobenzoic acid

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Proceeding in the same manner as that described in part A of Example 6 above, 14.3 g (0.05 mole) of tetrachlorophthalic anhydride, 16.0 g (0.052 mole) of 76.5 percent active 1-n-octyl-2-methylindole and 13.3 g (0.10 mole) of aluminum chloride were interacted to obtain 2-[(1-n-octyl-2-methyl-3-indolyl)carbonyl]-3,4,5,6-tetrachlorobenzoic acid (Formula VIII: R0 =R1 =R2 =R3 =Cl; R5 =CH3 ; R6 =(CH2)7CH3 ; Y1 =H), a pale orange solid melting at 132°-134° C. The infrared spectrum, showing a maximum at 1745 cm-1 (C=O; s) and the nuclear magnetic resonance spectrum was in accord with the structure.

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