abstract |
PROCEDURE FOR THE PREPARATION OF THE 4,4'-DINITROESTILBEN-2,2'- DISULPHONIC ACID AND ITS SALTS OF THE FORMULA (I), WHERE M IS HYDROGEN, AN ALKALINE METALLIC CATION OR AN AMMONIUM CATION, BY OXIDATION OF THE 4-NITROTOLUEN-2-SULPHONIC ACID OR ITS SALTS WITH AN OXIDIZING AGENT WHERE OXIDATION IS MADE IN LIQUID AMMONIA, FREE OF WATER, IN ITS DERIVED RENTAL EVENTUALLY IN THE PRESENCE OF WATER AND / OR IN ITS MIXTURES BETWEEN IN PRESENCE POWERFUL. |