Modelling the active sites of heterogeneous titanium epoxidation catalysts using titanium silasesquioxanes: insight into specific factors that determine leaching in liquid-phase processes

Active catalysts for the epoxidation of alkenes by tert-butyl hydroperoxide are provided by silasesquioxane titanium(IV) derivatives; a non-leaching catalyst, not prone to irreversible protic cleavage of its siloxy functions by the oxidizing agent, contains a terdentate silasesquioxane ligan