In contrast to their addition to esters, Grignard reagents add to dimethyl formamide (DMF) once. Why is this? Propose a mechanism for all three steps for the reaction shown below. The 1-carbon Homologation of alkyl or aryl bromides using Grignards and DMF. 1. Mg,Et2O RX 2. DMF X=Cl,Br,I 3. HCl,H2O The addition of a Grignard to DMF results in the generation of the corresponding aldehyde. When is the aldehyde formed, before or after acidic workup? What would happen (if anything) if you generated the aldehyde before workup