Oxidation of light alkanes, CH4, C2H6, and C3H8, could be performed at 40°C by using the EuCl3-catalytic system (EuCl3, O2, Zn0, and CF3CO2H). In the case of CH4 oxidation, MeOH was produced from CH4 but CO2 from CF3CO2H could not be avoided. However, selective oxygenations of C2H6 (89% selectivity) and C3H8 (91%) could be performed. In the oxidation of C2H6, EtOH was primary product and the successive oxidation of EtOH gave MeCHO and CO2. Regio-selectivities (1°:2°) observed in the oxidation of C3H8 suggested that an electrophilic active oxygen species was generated in the EuCl3-catalytic system. This active oxygen could not oxidize C-H bonds of MeOH (CF3CO2Me) because of a strong electron-withdrawing effect of CF3CO-group. Eu2+ species produced by the reduction with Zn0 was studied by UV-visible spectra. The spectral data proposed that O2 was reductively activated through the redox of Eu3+/Eu2+.
Research on Chemical Intermediates – Springer Journals
Published: Jan 1, 2000
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