Preparation of 3-amino-4-hydroxybenzoic acids

Details Preparation of 3-amino-4-hydroxybenzoic acids Preparation of 3-amino-4-hydroxybenzoic acids

C - Chemistry, Metallurgy

07

C

260/512.9

C07C 205/59 (2006.01) C07C 205/58 (2006.01)

Patent

CA 1262251

ABSTRACT This invention is directed to a process for the preparation of a 3-amino-4-hydroxybenzoic acid which comprises: (a) contacting a p-halobenzoic acid with nitric acid in an acidic reaction medium under conditions such that a 3-nitro-4-halo- benzoic acid is prepared; (b) contacting the 3-nitro-4-haloben- zoic acid with an alkali metal hydroxide in a reaction medium under conditions such that the halo moiety is replaced with a hydroxide moiety, to prepare a 3-nitro-4-hydroxyben- zoic acid, or salt thereof; and (c) reducing the 3-nitro-4-hydroxy- benzoic acid in a reaction medium under condi- tions such that a 4-hydroxy-3-aminobenzoic acid is prepared. 33,091A-F

510763

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