[reaction: see text] The conversion of the iodine ate-complex 5 to the Grignard reagent 6 follows a rate law first order in 5 and in magnesium ions. In addition to this normal pathway of the halogen-metal exchange process, the conversion of 5 to 6 is catalyzed by a number of diverse "electrophiles". This points to a SET-initiated radical chain process as a second pathway for the conversion of the iodine ate-complex 5 to the Grignard reagent 6.
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Hoffmann et al. (2003) studied this question.
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