1-Bromo-2-methylpropane is treated sequentially with i$) \mathrm{Mg}, \mathrm{Et}_2 \mathrm{O}$ ii)

Question

1-Bromo-2-methylpropane is treated sequentially with i$) \mathrm{Mg}, \mathrm{Et}_2 \mathrm{O}$ ii) $\mathrm{CO}_2$, iii) $\mathrm{H}_3 \mathrm{O}^{+}$. What is the product formed?

Professor PC Thomas Classes · Answer

Grignard formation followed by $CO_2$ insertion and protonation extends the chain by 1 carbon to form 3-methylbutanoic acid.