| abstract |
Process for the preparation of o, o'-dithiodibenzoic acids by reacting diazotized anthranilic acids or esters with sulfur dioxide in the presence of acid, water and a copper salt and, if desired, in the presence of alkali iodide in a 1st stage at a temperature of 20 to 50 ° and then in a second stage at a temperature of 80 to 100 °.n n n The o, o'-dithiodibenzoic acids obtainable by the process of the invention are valuable starting materials for the production of crop protection agents, dyes and pharmaceuticals. |