The invention claimed herein provides a process to oxidize N-(5-alkoxy-2-methyl-4-nitrophenyl)acetamides to N-acyl-2-amino-4-alkoxy-5-nitrobenzoic acids using potassium permanganate in the presence of magnesium sulfate in aqueous sulfolane or aqueous pyridine.

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US Patent 7294740 Process for the synthesis of N-acyl-2-amino-4-alkoxy-5-nitrobenzoic acids

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