Grignard Reagents ($R-MgX$) are organometallic compounds of immense synthetic importance.

• Synthesis: $R-X+Mg\stackrel{\text{dry ether}}{\to }R-Mg-X$
• Dry Ether Solvent: It is crucial because Grignard reagents are highly reactive toward moisture (proton sources). Ether also stabilizes the reagent by coordinating to the Magnesium atom.
• Nature: The $C-Mg$ bond is highly polar ($C^{\delta -}-M{g}^{\delta +}$), making the R group a very strong nucleophile and a strong base.