Daftar Isi: Ag+ Catalysed Oxidation of Some Typical Functional Groups by Ceric Salts in H2SO4 and HNO3 Media

Daftar Isi:

Department of Chemistry, Nizam College, Hyderabad-500 001 Manuscript received 10 April 1978, revised 4 October 1978, accepted 24 April 1979 A comparative study of the Ag+ catalysed oxidation of ethanol, formaldehyde, acetone and acetic acid by eerie nitrate in HNO3 medium and eerie sulphate in H2SO4 medium was undertaken to explain the mechanism of the catalysed reaction. The change in Ce4+ reactive species in the two different media produces a marked effect in the relative rates of the catalysed and uncatalysed reaction. The catalysis was found to be more pronounced in the H2SO4 medium. The order of [Ce4+] was found to be one and that of [Ag+] was fractional hi both the media studied. When low concentration of [Ag+] was employed the order was nearly one in sulphuric acid medium. The order of the [substrate] changed from unity in the uncatalysed reaction to fractional order in the catalysed reaction in H2SO4 medium. However, in HNO8 medium the order of the [substrate] was found to be fractional both in the catalysed and uncatalysed reactions. A mechanism involving the formation of (Ag-substrate)+ adduct and the reaction of Ce4+ species or (Ce4+-substrate) complex with the Ag+-adduct was proposed to explain the kinetic data.