Preparation of nitrobenzoic and anthranilic acids
First Claim
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1. A process for preparing nitrobenzoic acids of the general formula I ##STR10## where X1 and X2 are each fluorine, chlorine, bromine, hydrogen or nitro, by oxidizing the corresponding nitrotoluene of the general formula II ##STR11## with nitric acid, which comprises carrying out the oxidation in the presence of sulfuric acid and vanadium(V) compounds.
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Abstract
Nitrobenzoic acids I ##STR1## (X1, X2 =fluorine, chlorine, bromine, hydrogen or nitro) are prepared by oxidizing the corresponding nitrotoluene II ##STR2## with nitric acid in the presence of sulfuric acid and vanadium(V) compounds, and anthranilic acids III ##STR3## (Y1, Y2 =fluorine, chlorine, bromine, hydrogen or amino) are prepared from the nitrobenzoic acids I by reduction.
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2 Claims
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1. A process for preparing nitrobenzoic acids of the general formula I ##STR10## where X1 and X2 are each fluorine, chlorine, bromine, hydrogen or nitro, by oxidizing the corresponding nitrotoluene of the general formula II ##STR11## with nitric acid, which comprises carrying out the oxidation in the presence of sulfuric acid and vanadium(V) compounds.
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2. A process for preparing anthranilic acids of the general formula III ##STR12## where Y1 and Y2 are each fluorine, chlorine, bromine, hydrogen or amino, by oxidizing the corresponding nitrotoluene of the general formula II ##STR13## where X1 and X2 are each fluorine, chlorine, bromine, hydrogen or nitro, with nitric acid to obtain nitrobenzoic acid of the general formula I ##STR14## and isolating and subsequently reducing this nitrobenzoic acid, which comprises carrying out the oxidation in the presence of sulfuric acid and vanadium(V) compounds.
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