Since acetone is essentially a ketone (double bonded oxygen across carbon chain), I wonder if you could form the imine by reacting bromo-acetone with methylamine, then reducing that to the corresponding methyl-amino structure. Then when the grignard is utilized, instead of forming p-2-p at the end, it would form meth. Hmmmm, the possibilities are endless!
hatred of ontological wastes, and the marathon!!!!