Preparation of o,o'-dithiodibenzamides
AssigneeBASF SE
InventorHagen Jaedicke
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Abstract
o,o'-Dithiodibenzamides of the formula ##STR1## where R.sup.1 and R.sup.2 are each hydrogen, alkyl or phenyl, R.sup.3 is hydrogen, halogen, nitro, methyl or methoxy, and R.sup.4 has the same meanings as R.sup.3, are prepared by nitrosating an anthranilamide of the formula ##STR2## and reacting the product with sulfur dioxide in the presence of copper or a copper salt.
Claims4
A process for the preparation of an o,o'-dithiodibenzamide of the formula ##STR6## where R.sup.1 and R.sup.2 are each hydrogen, alkyl of 1 to 4 carbon atoms or phenyl, R.sup.3 is hydrogen, chlorine, bromine, fluorine, nitro, methyl or methoxy, and R.sup.4 has the same meanings as R.sup.3 and is identical to or different from R.sup.3, wherein an anthranilamide of the formula ##STR7## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 have the above meanings, is nitrosated in water as a solvent at a temperature of from 0.degree. to 40.degree. C., and the product is reacted at a temperature of from 10.degree. to 100.degree. C. in water with sulfur dioxide in the presence of copper, a copper compound or a copper salt derived from bivalent copper.
Dependencies are inferred from the claim text.