# Why do Grignard reagents form? [closed]

Why does magnesium insert itself between a carbon atom and halogen atom? Can anyone give any vague idea about why this occurs?

Also does a Grignard reagent only form when there is carbon atom and halogen atom with single bond between them? For example, can magnesium insert between the carbon and oxygen atoms of a carbonyl?

• Reactions happen because of decrease in chemical potential associated with it. More precisely they happen if activation energy is provided, products are stable thermodynamically or kinetically and there's a viable pathway for it. Are youu asking about pathway or what? – Mithoron Feb 2 '17 at 21:32

For your second query, I don't think it is feasible as the $\ce{C=O}$ carbonyl bond is rather stable.