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Now showing items 31-40 of 51
Oxazoline directed lithiation of Calix[4]arene and Ferrocene
(Stellenbosch : Stellenbosch University, 2011-12)
ENGLISH ABSTRACT: The use of chiral oxazoline directed lithiation provides a highly diastereoselective (up to >99%
de) route to meta functionalised inherently chiral calixarenes. This methodology can be used on
both the ...
Reactions of gold(I) electrophiles with nucleophiles derived from group 6 Fischer-type carbene complexes
(Stellenbosch : University of Stellenbosch, 2003-04)
ENGLISH ABSTRACT: This study comprises the preparation and characterisation of various novel
organometallic species of gold(I) by employing a range of anionic group 6 metal
Fischer-type carbene complexes and group 6 ...
Investigation into the semiochemical communication involved in neonatal offspring recognition in sheep
(Stellenbosch : University of Stellenbosch, 2010-03)
ENGLISH ABSTRACT:
Sheep husbandry substantially contributes to South Africa’s economy. Lamb
mortality is regarded as a major constraint to sustainable sheep production, and an
important factor in lamb survival is the ...
A DFT study of the catalytic hydrocyanation of ethylene with nickel complexes
(Stellenbosch : Stellenbosch University, 2005-12)
ENGLISH ABSTRACT: DFT calculations employing the B3LYP functional were done to investigate the mechanism for the Ni-catalyzed hydrocyanation of ethylene as proposed by Tolman. Although this reaction is an important industrial ...
Novel ion-exchange materials derived from poly(styrene-co-maleimide) and a study of the extraction and recovery of gold (III) chloride from acidic solutions
(Stellenbosch : Stellenbosch University, 2013-03)
ENGLISH ABSTRACT: In this study an economical, environmentally friendly, selective and efficient process for the extraction and recovery of [AuCl4]- from aqueous acidic chloride-rich solutions, particularly those aqueous ...
Chemical characterisation of the aroma of honeybush (Cyclopia) species
(Stellenbosch : University of Stellenbosch, 2010-12)
ENGLISH ABSTRACT:
Honeybush tea, also known as “South Africa’s sweetest tea”, is a herbal tea made from the
leaves and twigs of Cyclopia spp., indigenous to the fynbos biome in the Western and Eastern Cape
provinces of ...
The cyclotron production of selected radionuclides using medium energy protons
(Stellenbosch : Stellenbosch University, 2008-03)
ENGLISH ABSTRACT: Radiochemical research involving ion exchange chromatography is of paramount
importance to the future of radionuclide production at the Radionuclide Production
Group (RPG) of iThemba LABS. It is required ...
A multinuclear magnetic resonance spectroscopy study of E/Z configurational isomers of unsymmetrical N-alkyl-N-alkyl(aryl)-N'-acylthioureas of platinum(II) complexes
(Stellenbosch : Stellenbosch University, 2006-12)
ENGLISH ABSTRACT: The partial double bond character of the carbon-nitrogen bond of the (S)C-NRR’ moiety results in unsymmetrical
dialkyl-substituted N-alkyl-N-alkyl(aryl)-N’-acylthioureas, R”C(O)NHC(S)NRR’ (HL) displaying ...
Use of the RAFT technique as an efficient method to synthesise well defined polymer-clay nanocomposites with improved properties
(Stellenbosch : University of Stellenbosch, 2009-03)
Synthesis and structural characterization of two novel cationic and three new neutral
reversible addition–fragmentation chain transfer (RAFT) agents is described. The
cationic RAFT agents bear a quaternary ammonium group: ...
Application of modern analytical techniques and chemometric methods to the chemical characterisation of South African wines : determination of non-volatiles
(Stellenbosch : Stellenbosch University, 2004-12)
ENGLISH ABSTRACT: The present study deals in the first instance with the improvement of current analytical
techniques for the analysis of the non-volatile content of wines. An improved sample
preparation method, using ...