The extension to a larger scale'of our earlier synthesis2 of the resolvable d, L4, 6, 4', 6'- tetrachlorodiphmenic acid required the preparation of large amounts of 3, S-dichloro-2- aminobenzoic acid. The present paper describes the conditions we found best for the direct chlorination of anthranilic acid in either glacial acetic acid or in dilute hydrochloric acid. We have also identified three of the polychloro by-products which are formed in acetic acid ...
