Jacobsen-katsuki epoxidation

In this interesting paper (Helvetica chimica acta, 2009, 92, 623-628), the difficulty of the epoxidation of terminal olefins by the Jacobsen-Katsuki epoxidation is discussed and slightly improved by slight modifications in the procedure. The modifications are basically on the promoter of the reaction. The dependence on the solvent is also clear. Although it is interesting, a lot of things remain unclear on this reaction and further improvements are needed for difficult (terminal) olefins as styrene.