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The intermediate radicals generated by abstraction of a halogen or other X group with R3Sn· can also be trapped by double and triple bonds to forn new C-C bonds. These radical cyclizations work most efficiently when 5-membered rings are being formed. It is often necessary to carefully control concentrations and reaction conditions to avoid capture of the intermediate radicals by R3Sn-H to form reduction rather than cyclization products.
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