Now showing items 1-5 of 5
Speciation and interconversion mechanism of mixed halo and O,O- and O,N-bidentate ligand complexes of zirconium
(University of the Free State, 2009-05)
English: The aim of this project is to find significant chemical differences between the fluorinated O,O-bidentate ligand complexes of zirconium and hafnium which would allow the separation and purification of these metals. ...
Studies directed at the stereoselective synthesis of flavonoids through the hydrogenation of prochiral precursors
(University of the Free State, 2008-11)
English: The in vitro studies of biologically active flavonoids are hampered by the inaccessibility of all monomeric units in enantiomerically pure form. Although a number of these scalemic flavonoids can be obtained ...
Polyphenols from pericopsis elata and synthesis of selected stilbenes
(University of the Free State, 2005-05)
English: The bark of Pericopsis elata (Afrormosia elata) is used by the local population of the Democratic Republic of Congo for the treatment of cancer and for external applications because of its weather resistance. ...
Speciation and interconversion mechanism of mixed halo O,O' - and N,O-bidentate ligand complexes of hafnium
(University of the Free State, 2009-04)
English: Hafnium and zirconium show extremely similar chemical properties and occur together in nature. Zirconium ore (commonly referred to as zircon) always contains 1 – 3% hafnium, and the separation of hafnium and ...
Synthesis and functionalisation of polyepichlorohydrin
(University of the Free State, 2004-12)
During this study, benzo-15-crown-5 was synthesised as sodium cation scavenging ligand. This crown ether moiety was then functionalised to 4’-formylbenzo-15-crown-5 and 4’-(hydroxymethyl)benzo-15-crown-5. The first synthesis ...