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. ... Studies directed toward taxanes. Preparation of α-ketols by oxidative ring-opening of epoxides. ... Protonic acid promoted ring-opening of epoxides by dimethyl sulphoxide at room temperature followed by treatment with diisopropylethylamine at −78°, affords α-ketols in ...