A new insight into the oxidation of cyclododecane with hydrogen peroxide in the presence of iron-substituted polyoxotungstates

resumo

The catalytic homogeneous oxidation of cyclododecane with hydrogen peroxide in the presence of tetrabutylammonium salts of iron-substituted Keggin-type polyoxotungstates of general formula (TBA)(4)HzXW11Fe(H2O)O-39 nH(2)O (where X = P, Si, B, and z = 0-2) is described. In the reaction conditions reported. the corresponding alcohol, ketone, and hydroperoxide are obtained as the main reaction products. The catalytic activity of the anions with phosphorous, silicon, and boron is compared in different reaction conditions. These catalytic oxidation reactions seem to be radical processes, since they are totally inhibited in the presence of I-2, a well-known radical scavenger.

palavras-chave

KEGGIN-TYPE POLYOXOTUNGSTATES; CYCLOHEXYL HYDROPEROXIDE; CLEAVAGE REACTIONS; ALKOXY RADICALS; CATALYSTS; TUNGSTOPHOSPHATES; DECOMPOSITION; CYCLOALKANES; OXYGENATION; CHEMISTRY

categoria

Chemistry

autores

Santos, ICMS; Simoes, MMQ; Balula, MSS; Neves, MGPMS; Cavaleiro, JAS; Cavaleiro, AMV

nossos autores

agradecimentos

Thanks are due to the University of Aveiro, FCT, and FEDER for funding. I.C.M.S. Santos and M.S.S. Balula are also grateful to FCT and FSE for their grants.

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