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3839890 
Book/Book Chapter 
Carboxylic acids, aromatic 
Röhrscheid, F 
2000 
Yes 
Wiley‐VCH 
Weinheim, Germany 
Ullmann's encyclopedia of industrial chemistry: Volume 7 
113-123 
English 
is a chapter of 3827349 Ullmann's encyclopedia of industrial chemistry
The production of virtually all industrially important aromatic carboxylic acids involves either the partial oxidation of aromatic alkyl groups or the partial oxidative degradation of the aromatic ring with atmospheric oxygen. The oxidation of the methyl groups of xylene exemplifies the former case.

Such oxidizing agents as dichromate, permanganate, hypochlorite, chlorine, and nitric acid, which were used a few decades ago, have been replaced in almost all cases by atmospheric oxygen. The advantage of air oxidation is that only carbon dioxide and water are formed as the main byproducts. The progress made in modern oxidation techniques has gone hand in hand with the development of the synthesis of benzoic acid and of the two major products phthalic acid and terephthalic acid. 
6th 
Elvers, B 
9783527303854