Catalytic performance of Preyssler heteropolyacid as a green and recyclable catalyst in oxidation of primary aromatic amines

Many substituted anilines were converted into the corresponding azoxy benzenes as major products, by hydrogen peroxide, using Preyssler catalyst.The ability of various Preyssler catalysts as pure, H14[NaP5W30O110], mixed addenda, H14[NaP5W29MoO110], and cetylpyridinium acidic salt, was investigated. In all cases, the highest yield of azoxy compounds was observed, using H14[NaP5W30O110] as catalyst. The oxidations of anilines with 30% H2O2 catalyzed by Preyssler catalysts in various solvents with different molar ratio of amine to oxidant, have been investigated and the results showed that the reaction yields were affected by changing the solvent as well as molar ratio of amine:oxidant.

Graphical abstractOxidation of aniline derivatives with hydrogen peroxide in the presence of Preyssler catalyst results in the formation of corresponding azoxy compounds as major product at reflux temperature and 4 h. This catalyst catalyzes oxidation reactions without any degradation of structure in the presence of hydrogen peroxide.Figure optionsDownload full-size imageDownload as PowerPoint slide