How do ether oxygen atoms stabilize the magnesium atom in a Grignard reagent?

Ether oxygen atoms stabilize the magnesium atom in a Grignard reagent through the process of complexation. Because ethers possess nonbonding electron pairs on their oxygen atoms, they are able to share these lone pairs with the electron-deficient magnesium atom.1

This interaction forms a stable complex that serves two primary purposes: it helps to stabilize the reagent itself and facilitates its solubility in the solution. Without the presence of an ether to provide this electron sharing, Grignard reagents generally cannot form.1