Herbicide 8-quinolinecarboxylic acid and its removal from aqueous solution using sodium montmorillonite, acidic montmorillonite and organo-acidic montmorillonite has been reportedIt may be used in the synthesis of: . novel oxorhenium(V) complexes incorporating quinoline and isoquinoline carboxylic acid derivatives. . chiral 1,2,3,4-tetrahydroquinolinyl-oxazoline compounds, used as ligands for Ru-catalyzed asymmetric transfer hydrogenation of ketones. . chiral quinolinyl-oxazoline compounds, used as ligands for Cu(II) catalyzed asymmetric cyclopropanation. Herbicide 8-quinolinecarboxylic acid and its removal from aqueous solution using sodium montmorillonite, acidic montmorillonite and organo-acidic montmorillonite has been reported It may be used in the synthesis of: . novel oxorhenium(V) complexes incorporating quinoline and isoquinoline carboxylic acid derivatives. . chiral 1,2,3,4-tetrahydroquinolinyl-oxazoline compounds, used as ligands for Ru-catalyzed asymmetric transfer hydrogenation of ketones. . chiral quinolinyl-oxazoline compounds, used as ligands for Cu(II) catalyzed asymmetric cyclopropanation.