Peracetic acid and perbenzoic acid were generally used as the peracid.

When using a peracid, the epoxidation reaction was performed non-catalytically or with an acid catalyst such as sulphuric acid or phosphoric acid.

The epoxidation of aldrin was obtained by reaction with a peracid (producing dieldrin and an acid by-product) or with hydrogen peroxide and a tungstic oxide catalyst (producing dieldrin and water).