Studies of intermediates formed under the conditions of preparative electroreduction of naphthalene 1-nitro-3,6,8-trisulfo acid

摘要

The effect is studied of the conditions of preparative reduction of naphthalene 1-nitro-3,6,8- trisulfo acid, particularly, the cathode material, temperature, and current density on the yield of intermediate naphthalene 1-hydroxylamino-3,6,8-trisulfo acid. It is shown that formation of naphthalene 1-hydroxy- lamino-3,6,8-trisulfo acid in reaction solutions results not only in a decrease in the yield of target naphtha- lene 1-amino-3,6,8-trisulfo acid, but also in a decrease in the quality of the latter, which is manifested in a decrease in the yield into its conversion to naphthalene 1-amino-8-oxy-3,6- disulfo acid. Conditions are found for preparative reduction of naphthalene 1-nitro-3,6,8-trisulfo acid providing the lowest yield of naph- thalene 1-hydroxylamino-3,6,8-trisulfo acid in reaction solutions.