FIELD: chemical technology. SUBSTANCE: invention relates to method of epoxidation of prochiral olefin. Method involves interaction of prochiral olefin with oxygen source in the presence of salt catalyst. Epoxidation is carried out in the presence of isoquinoline N-oxide as ligand donor. Compound of formulas (IB) or (II) characterized by claim 2 of the invention claim are used as catalyst. Except for, invention proposes variant of method where interaction of prochiral olefin with oxygen source is carried out in the presence of compound of the formula (II) as salt catalyst and ligand source donating electron. EFFECT: improved method of epoxidation. 7 cl, 21 ex
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