The aromatic amino group in the various reduction products was also replaced by other functional groups after diazotization under controlled conditions. This approach follows the method of Kornblum and Ifflands who found that in a sufficiently acidic medium (PH 3 or less) an aryl amino group can be diazotized selectively and then replaced by hydrogen on treatment with hypophosphorous acid even in the presence of an aliphatic amino group. ...
