CATALYTIC SELECTIVE OXIDATION OF AMINES WITH HYDROPEROXIDES OVER MOLECULAR-SIEVES - INVESTIGATIONS INTO THE REACTION OF ALKYLAMINES, ARYLAMINES, ALLYLAMINES AND BENZYLAMINES WITH H2O2 AND TBHP OVER TS-1 AND CRS-2 AS THE NEW CATALYST

The liquid phase oxidation of various substituted amines with dil H2O2 and tert-butyl hydroperoxide (TBHP) has been investigated over titani um and chromium silicates respectively. While TS-1/H2O2 combination ex hibits a remarkable activity and selectivity in the oxidation of aryla mines to produce the symmetrical azoxybenzenes, CrS-2 catalyzes the se lective oxidation of various substituted amines to the corresponding n itro compounds by oxidation with 70% TBHP. The nature of the reactive intermediates during the oxidation of anilines to nitrobenzenes has be en established using cyclic voltammetry experiments. Further, amines p ossessing a C-H bonds are selectively oxidized to either oximes or the carbonyl compounds on reaction with H2O2 catalyzed by TS-1.