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Sustainable synthesis of balsalazide and sulfasalazine based on diazotization with low concentrated nitrogen dioxide in air

Low concentrated nitrogen dioxide, which arises as side product from a range of industrial processes, can effectively be recycled through the diazotization of anilines. The studies reported herein now demonstrate that the removal of nitrogen dioxide from gas streams is even more effective when hydrophilic anilines are used as starting materials. The diazonium salts, which are obtained in this way in up to quantitative yields, can directly be employed in azo coupling reactions, thus opening an attractive access to the industrially important group of azo compounds.

Autoren:   Markus Rolf Heinrich, Dagmar Hofmann, Eva Gans, Jasmin Krüll
Journal:   Chemistry - A European Journal
Jahrgang:   2017
Seiten:   n/a
DOI:   10.1002/chem.201605359
Erscheinungsdatum:   05.01.2017
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