Abstract
Haloperoxidases are enzymes which catalyze the incorporation of halogen atoms into organic molecules. They are found throughout nature, playing a major role in the defence system of many organisms. Their reaction mechanisms as well as their use as catalysts for halogenation and oxidation reactions on laboratory and industrial scales are discussed. Up to now, selective halogenation reactions have only been reported for the chloroperoxidase from Pseudomonas pyrrocinia. The usefulness of the other enzymes is based on their ability to produce hypohalous acid (HOX) in a controllable way, allowing the smooth (yet nonselective) halogenation of electron-rich substrates. On the other hand, it has been shown recently that some haloperoxidases can stereoselectively convert sulfides and alkenes into their corresponding homochiral oxides. Therefore, these enzymes will undoubtedly gain importance in the near future.
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