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

摘要

The liquid phase oxidation of various substituted amines with dil H2O2 and tert-butyl hydroperoxide (TBHP) has been investigated over titanium and chromium silicates respectively. While TS-1/H2O2 combination exhibits a remarkable activity and selectivity in the oxidation of arylamines to produce the symmetrical azoxybenzenes, CrS-2 catalyzes the selective oxidation of various substituted amines to the corresponding nitro compounds by oxidation with 70% TBHP. The nature of the reactive intermediates during the oxidation of anilines to nitrobenzenes has been established using cyclic voltammetry experiments. Further, amines possessing a C-H bonds are selectively oxidized to either oximes or the carbonyl compounds on reaction with H2O2 catalyzed by TS-1. [References: 45]