4,4¢-Bis(dichloroiodo)biphenyl and 3-(dichloroiodo)benzoic acid are convenient recyclable hypervalent iodine reagents for vicinal chloromethoxylation or iodomethoxylation of unsaturated compounds. The reactivity of these reagents in the reaction of vicinal halomethoxylation is generally similar to dichloroiodobenzene and the advantage of their use is that the reduced forms of these reagents can be easily separated from the reaction mixture and reused for the regeneration of the reagents.

Reactions of (dichloroiodo)benzene or (dichloroiodo)benzene/iodine with various monoterpenes in methanol provide a selective approach to the respective products of chloromethoxylation or iodomethoxylation of the double bond. The halomethoxylation of (+)-3-carene, carvone, and β-pinene proceeds with especially high regio-and stereoselectivity affording an appropriate single product in each case, while the reaction of limonene gives products of functionalization of both double bonds. This new methodology for the controlled introduction of halogen substituents into the structure of naturally occuring monoterpenes provides an entry into various potentially important synthetic intermediates.

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