Catalysts for selective aerobic oxidation under ambient conditions - Advances in Catalytic Activation of Dioxygen by Metal Complexes - page 259

Importantly, the ratio of initial rates is 180 in competitive oxidation, while it
is only 7 when THT and CEES are oxidized separately. An additional point
to be made is that in the competitive oxidation, CEES starts to be oxidized
with a much higher rate only when almost all (97%) THT is
consumed. This rate is similar to that of CEES oxidation when it is tested
alone, indicating that in the mixed substrate system the catalyst has
extremely high substrate selectivity and that THTO has very little if any
inhibitive effect on the oxidation of CEES. Thus, this study shows that
thioethers other than CEES can also be oxidized in this system with
efficiencies even higher than that for CEES. Competitive oxidation reveals
that this catalyst discriminates between different thioether substrates with
considerable efficiency.

19. EXPERIMENTAL DETAILS

General procedures. Quantification of thioethers and sulfoxides was
performed on an HP5890 Gas Chromatograph equipped with a FID detector
and a 5% phenyl methyl silicone capillary column. As an internal standard
for GC analyses, 1,3-dichlorobenzene was used. Identification of products
was performed using a HP 5890 GC with a 5% phenyl methyl silicone
capillary column and a 5971A Mass Selective Detector. Quantification of
Au(III) concentration was performed using a HP 8452A Diode Array
Spectrophotometer. The oxygen concentration was varied using a Series 810
Mass Trak flow-meter with dried argon as the other gas.