CHs rignard reagent, acid or base, and any brominating agent. You do not have to show how the Grignard reagent is made. 42 Write a synthesis of 2-bromo-2-methyl butane starting with butanone. You may use any CH3 CH2 C CH3 → CH3 CH2 C CH3 CH3 43. Write a synthesis of 2-butanol starting with ethanol. You may use any Grignard reagent, any oxidizing or reducing agent, and acid or base. You do not have to show how the Grignard reagent is made.