Chapter 15.3, Problem 2P

Write equations showing how you could prepare $\text{2-methylpropylmagnesium bromide}$

$\left[{\left({\text{CH}}_3\right)}_2{\text{CHCH}}_2\text{MgBr}\right]$

from $\text{2-methylpropene}$

and any necessary organic or inorganic reagents.