The Mannich reaction of 8-quinolinol with aliphatic secondary amines gives products that are stronger bases than 8-quinolinol. As expected from the high base strength of these substances they form chelate compounds with metal ions only at high PH. The chelate compounds of 7, 1'-piperidylmethyl-S-quinolinol with cupric, ferric, indium and uranyl ions are similar to the corresponding 8-quinolinolates in most respects except PH of ...
