When we add magnesium to alkyl halide, Grignard reagent is formed. $$\ce{R-X + Mg -> RMgX } $$ It is highly nucleophilic in nature. Now at this time the electrophilic alkyl halide is also present in the solution why doesn't grignard reagent simply attack the alkyl halide again ?? $$\ce{ RMgX + R-X -> R-R + MgX2}$$ Why doesn't this reaction take place ??


marked as duplicate by Mithoron, Waylander, Tyberius, Nilay Ghosh, Todd Minehardt Jul 13 at 16:43

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  • $\begingroup$ The above does contain the answer, although the question itself has a few more points. $\endgroup$ – William R. Ebenezer Jul 12 at 17:32
  • $\begingroup$ Because what happens is mainly exchange between the initial Grignard and the alkyl halide. If you want coupling you need to add Cu(I), even then its not that good. $\endgroup$ – Waylander Jul 12 at 20:09
  • $\begingroup$ Alternatively, how is it possible to make a Grignard reagent if coupling is an issue? $\endgroup$ – user55119 Jul 15 at 15:32