Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Catalytic amounts of tris p-bromophenylammoniumyl hexachloroantimonate induce on enol-ethers, at low temperature, in oxygen-saturated methylene chloride, an easy electron-transfer oxygenation yielding, in high yield, the corresponding 1,2-dioxetanes.