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(5) Free-radical addition of hydrogen halides to alkenes - Anti- - page 2 / 13

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Mechanism:

Note the use of single-headed 'fishook' arrows to indicate movement of a single electron.

(6) Oxidation of alkenes with per-acids - formation of epoxides:

The reaction is a concerted syn- addition of an oxygen atom to the double bond - the C-C -bond is broken and the two C-O bonds are formed simultaneously - so that the stereochemistry of the alkene is

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