Dialkyl and diary1 monoselenides are oxidised to selenoxides by an equimolar quantity of ozone. Diselenides react with three mol. of ozone, to give seleninic anhydrides; the same products are formed on oxidation with t-butyl hydroperoxide under anhydrous conditions. In neither case were intermediate products isolable. A possible mechanism of oxidation is discussed and the rates of ozonisation of mono-and di-selenides are compared with those of olefins and sulphides. A method for the preparation of the hitherto unknown seleninyl chlorides Ar-SeOC1 is presented.THE reaction of an organic monoselenide with ozone has received only one mention in the literature,l compared with the several, reviewed by Bailey,2 to the ozonisation of sulphur compounds. Reactions of organoselenium compounds with other oxidants have been more extensively examined ; for instance, hydrogen peroxide yields selenoxides from
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