• Precursor of dimethyldioxirane, by reaction with K monopersulfate, and isolation in solution by low temperature distillation. For details, see: Chem. Ber., 124, 2377 (1991). It is an excellent reagent for rapid, stereospecific epoxidation of alkenes under mild conditions: J. Org. Chem., 50, 2847 (1985); Org. Synth. Coll., 9, 288 (1998). For improved work-up procedure allowing the possibility of more concentrated solutions or the isolation of acetone-free material, see: Tetrahedron Lett., 37, 3585 (1996). For biphasic, environmentally-friendly system (EtOAc-H2 O), see: Org. Process Res. Dev., 6, 407 (2002). Selective oxidation of phosphorus ylides occurs under mild conditions, providing a route to vicinal tricarbonyl derivatives: J. Org. Chem., 60, 8231 (1995). For conversion of ɑ-bromo-?-dicarbonyls to vicinal tricarbonyls, see: Tetrahedron Lett., 36, 7735 (1995). For formation of singlet oxygen by deoxygenation of heteroaromatic N-oxides, e.g. 4-diethylaminopyridine N-oxide, see: J. Chem. Soc., Chem.Commun., 1831 (1995). For reviews of dioxiranes, see: Acc. Chem. Res., 22, 205 (1989); Chem. Rev., 89, 1187 (1989).