Preparation of o,o'-dithiodibenzoic acids

Details Preparation of o,o'-dithiodibenzoic acids Preparation of o,o'-dithiodibenzoic acids

C - Chemistry, Metallurgy

07

C

260/509.7, 260/5

C07C 323/62 (2006.01) C07C 319/24 (2006.01)

Patent

CA 1207790

Abstract of the Disclosure: o,o'-Dithiodibenzoic acids are prepared by a process wherein a diazotized anthranilic acid or anthranilate is reacted with sulfur dioxide in the presence of an acid, water and a copper salt, and if desired in the presence of an alkali metal iodide, in a 1st stage at from 20 to 50°C and then in a 2nd stage at from 80 to 100°C. The o,o'-dithiodibenzoic acids obtainable by the process of the invention are useful starting materials for the preparation of crop protection agents, dyes and drugs.

419151

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