Browsing Doctoral Degrees (Chemistry) by Title
Now showing items 110-129 of 149
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Structure and synthesis of Gunnera perpensa secondary metabolites.
(2007)The project focused on the isolation, characterization and synthesis of secondary metabolites of Gunnera perpensa L. (Gunneraceae), a South African medicinal plant used by many South African women to induce or augment ... -
Structure, accessibility and 'reactivity' of cellulose I as revealed by CP/MAS13 C-NMR spectroscopy and atomic force microscopy.
(2009)The dissolving pulps used in this thesis are high-grade cellulose pulps, with low amounts of hemicellulose, degraded cellulose and lignin, produced by acid bi-sulphite pulping of a fast growing South African hardwood ... -
Structure, synthesis and biological activities of biflavonoids isolated from Ochna serrulata (Hochst.) Walp.
(2012)The phytochemistry of Ochna serrulata (Hochst.) Walp. was investigated for the first time; two new dimeric chalcones (5-deoxyurundeuvine C and serrulone A) and two new biflavonoid derivatives (4,4’,7-tri-O-methylisocam ... -
Studies of ionic liquid modified materials for adsorption of organic pollutants from aqueous media.
(2015)Abstract available in PDF file. -
Studies of some new Euphorbiaceae diterpenes.
(1971)The heartwoods of two species of South African Euphorbiaceae have been chemically investigated. From Cleistanthus schlechteri three new diterpenes possessing the hitherto unknown ent-isopimara-8(14),15-diene skeleton ... -
A study of chiral pentacyclo-undecane derived macrocycles and ligands.
(2004)Several chiral macrocyclic crown ethers and related analogues have shown to be capable of -
A study of modified mesoporous silica for the adsorption of selected organic pollutants.
(2016)Water is an essential natural resource the world over. Only one-tenth of the world’s water is pol-lution free and hence there is a need for remediating polluted water. These pollutants, some of which are organic (dyes and ... -
A study of nickel molybdenum oxide catalysts for the oxidative dehydrogenation of n-hexane.
(2009)Nickel molybdenum oxide catalysts with different chemical compositions have been synthesized and tested for the oxidative dehydrogenation of n-hexane. The co-precipitation method was used for the synthesis and several ... -
A study of photoinduced transformations of sunscreen chemical absorbers.
(2009)Solar ultraviolet radiation is known to have deleterious effects on human skin and is a major cause of skin cancer. Therefore, the topical application of sunscreen preparations has gained wide usage for skin protection. ... -
Supercritical fluid extraction and analysis of indigenous medicinal plants for uterotonic activity.
(1997)Ingestion of extracts prepared from various medicinal plants to induce or augment labour is common amongst Black South African women during the late stages of pregnancy. This applies particularly to the rural areas where ... -
Supported heterogeneous catalysts in synthetic and mechanistic studies of certain heterocyclic reactions.
(2017)Abstract available in PDF file. -
Supramolecular resorcin [4] arene-capped porphyrins : ligands towards homogeneous catalysis
(2008)The synthesis of cavitand-capped porphyrin ligands, with a view towards their potential as ligands in homogeneous catalysis, is described. The ligand apertures, one of which is outlined in the figure below, are focal ... -
Synthesis and analysis of Eriosema isoflavonoids and derivatives thereof.
(2011)Kraussianone 1 and kraussianone 2 were previously isolated as active compounds from the roots of Eriosema kraussianum Meisn., a plant used for the treatment of male impotence and urinary complaints in KwaZulu-Natal. The ... -
Synthesis and biological evaluation of fluorinated derivatives of 2-styrylchromones and 2-thioxo imidazole dicarboxylate esters.
(2012)Two classes of fluorinated derivatives were synthesized in this work to test the effects of the fluorinated drugs in antibacterial, antioxidant and anti-platelet activity. These two classes were the 2-styrylchromones and ... -
Synthesis and biological studies of novel pyranochromene derivatives.
(2015)Abstract available in PDF file. -
Synthesis and characterisation of chelating, hemilabile N-Heterocyclic carbene ligands : applications of their cobalt (II) and nickel (II) complexes as catalysts for aryl amination.
The chemistry and applications of N-heterocyclic carbenes (NHCs) as ligands for the preparation of transition metal complexes has remained at the forefront of research in organometallic chemistry and homogeneous catalysis ... -
Synthesis and characterisation of new Schiff base chelates of platinum group metals.
(2011)The principal goal of this work was to synthesise and fully characterise a range of platinum group metal chelates of bis(pyridine-imine) ligands. These four-nitrogen donor Schiff base ligands are underdeveloped relative ... -
Synthesis and characterisation of novel hienylphosphines and their gold(I) complexes.
(2000)This study comprises the preparation and characterisation of various novel tertiary monoand polyphosphines as well as their gold(I) complexes. The possible modes of coordination of mono-, bi- and tridentate phosphine ligands ... -
Synthesis and characterization of functionalized 1,8- diaminophosphines and perimidines of group 10-12 complexes and antimicrobial applications.
(2017)Abstract available in PDF file. -
Synthesis and emission studies of polypyridyl complexes of platinum (II).
(2002)Chapter One serves as an introduction to the photophysical properties of square-planar 2,2':6',2/1-terpyridyl and 6-phenyl-2,2'-bipyridylligand complexes of platinum(II). A brief description is provided of the absorption ...