α‐Iodoalkylmagnesium species were generated by reaction of 3‐oxygenated 1,1‐diiodoalkanes with isopropylmagnesium halides at −78%C. The resulting magnesium carbenoids were found to be configurationally stable at temperatures up to −20%C and were trapped by benzaldehyde or allyl iodide at low temperatures. Stereoselectivity on exchange of the diastereotopic iodine atoms in 3 was found to be low.
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Hoffmann et al. (1994) studied this question.
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