The principles underlying the mercurization of aromatic compounds have occupied the attention of one of us (Kh.) for the past two years. The important fact that, in a mono- substituted benzene derivative, the mercury enters $ x~~ a or ortho to the group already present in the molecule, was pointed out early by Dimr~ th,~ and has been substantiated by the vast amount of experimental work done by others. This fact of ortho and para ...
