Abstract
The inhibiting effect of N- and S-containing compounds during liquid phase oxygenation of alkylaromatics can be overcome by adding noble metal salts (RuCl3, RhCl3, PdCl2, IrCl3, PtCl2) to conventional Co/Mn/Br catalysts. Only 10 mol-% (based on Co/Mn/Br content) of the noble metal salt allow the practically uninhibited oxidation of e.g. dimethylnaphthalenes to naphthalenedicarboxylic acids in the presence of 10 mol-% (based on educt) of thionaphthene, quinoline or indole. Even primary aromatic amines (e.g. 2-aminonaphthalene) loose much of their inhibiting activity. However, noble metal salt addition completely blocks the oxidation reaction in the presence of O-containing compounds like cumarone or 3,5-xylenol due to oxidative degradation to phenolic substances.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
