Nice prep! And it's nice to see some characterization by TLC too. I would suggest using more diluted material to spot your plate with and to make your
eluent a little more polar (maybe 6:1 H:E) for better resolution.
Why don't you think the lower spot is the dinitro compound? That seems like a reasonable guess to me. Maybe you can crystallize the mononitro compound
out further and concentrate that impurity and get a melting point. |