Peroxycarboxylic acids, widely used for epoxidation in industry and general research, have various drawbacks, such as difficulty of preparation in a pure state, cost and the possibly ring-opening of the product epoxides due to acid-catalysed reactions; a new reagent, 5-hydroperoxycarbonylphthalimide, overcomes these problems.
James, A. P., Johnstone, R. A. W., McCarron, M., Sankey, J. P., & Trenbirth, B. (1998). 5-Hydroperoxycarbonylphthalimide: A new reagent for epoxidation. Chemical Communications, (3), 429–430. https://doi.org/10.1039/a708179k