Using of solid support in the catalytic oxidation molecular oxygen through niltro-nitrosyl couple complexed with a transition metal
Written by sctunisie no commentsFe(NO)2(PPh3)2 and Fe(NO)2I(PPh3)2 Complexes, in solution, and supported by fonctionalized polymers have been used as catalysts in the oxidation of cyclohexene by molecular oxygen (O2). Moreover, it has been found that this oxidation involves the group nitro-nitrosyle coordinated to iron. In contrast, the complex: Fe(NO)2(PPh3)2 does not present any reactivity towards the oxidation reaction of cyclohexene, indeed the oxidation causes an alteration of the ligand (when the complex in solution is used) or a loss of the metal on the support. Furthermore, the selectivity induced by the complex supported Fe(NO)2I(PPh3)2, is different from the one induced by homologous complex in solution. As a matter of fact, the complex in solution provides the epoxide in 22% yield, whereas the supported one leads to the formation of three compounds: epoxide 22 % cyclohexenol 40 % and cyclohexenone 33%.
H. Marrakchi
Pages 31-36
