Partial oxidation of light alkanes by reductively activated oxygen in Eu-catalytic system at 40 degrees C

Citation
I. Yamanaka et al., Partial oxidation of light alkanes by reductively activated oxygen in Eu-catalytic system at 40 degrees C, RES CHEM IN, 26(2), 2000, pp. 129-135
Citations number
15
Categorie Soggetti
Chemistry
Journal title
RESEARCH ON CHEMICAL INTERMEDIATES
ISSN journal
09226168 → ACNP
Volume
26
Issue
2
Year of publication
2000
Pages
129 - 135
Database
ISI
SICI code
0922-6168(2000)26:2<129:POOLAB>2.0.ZU;2-M
Abstract
Oxidation of light alkanes, CH4, C2H6, and C3H8, could be performed at 40 d egrees C by using the EuCl3-catalytic system (EuCl3, O-2, Zn-0, and CF3CO2H ). In the case of CH4 oxidation, MeOH was produced from CH4 but CO2 from CF 3CO2H could not be avoided. However, selective oxygenations of C2H6 (89% se lectivity) and C3H8 (91%) could be performed. In the oxidation of C2H6, EtO H was primary product and the successive oxidation of EtOH gave MeCHO and C O2. Regio-selectivities (1 degrees:2 degrees) 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 CF3C O-group. Eu2+ species produced by the reduction with Zn-0 was studied by UV -visible spectra. The spectral data proposed that O-2 was reductively activ ated through the redox of Eu3+/Eu2+.