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- 2-Nitrobenzoic acid is prepared by oxidation of 2-nitrotoluene.
- 3-Nitrobenzoic acid is a precursor to 3-aminobenzoic acid, which in turn is used to prepare some dyes. It is prepared by nitration of benzoic acid as well as benzaldehyde concomitant with oxidation.[clarification needed]
- 4-Nitrobenzoic acid is a precursor to 4-aminobenzoic acid, a precursor to the anestheic Procaine. It is prepared by oxidation of 4-nitrotoluene.
- Takao Maki, Kazuo Takeda "Benzoic Acid and Derivatives" in Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH, Weinheim. doi:10.1002/14356007.a03_555.
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