Till whatever I have studied in organic chemistry, Grignard's reagent has been the most helpful thing everywhere, whether is it preparation or reaction of organic compounds. But I haven't ever seen the Halogen part of RMgX reacting with any compound. Does the Halogen ever react in any reaction?

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    $\begingroup$ Maybe it does, it's just those reactions are not that helpful, so nobody uses them. $\endgroup$ Nov 9 '15 at 6:05

Lets look at Grignard's reaction route. Key step is nucleophilic addition of R. And MgX is removed with acid on the next step. Nobody cares about X - if you want MgX2 in solution you just add MgX2. The main reason to use Grignard's reagent is nucleophilic addition of R.

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