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A Combined Experimental and Computational Study of Hydridospirophosphorane Ligand Systems Featuring Halogenated Mandelic Acids
Get PDFThe search for new stereoselective catalysts remains important for the isolation of enantiomeric products from racemic mixtures. The need exists for these catalysts to be more efficient, to be more cost effective as well as be stable over time without undergoing changes in molecular structure and selectivity. The purpose of this research project was to experimentally synthesise and characterise asymmetric catalysts for the use in enantioselective synthesis. The catalysts consisted of the main group element phosphorous as central atom, with the phenyl rings of mandelic acid ligands monosubstituted with halogen atoms fluorine, chlorine and bromine in different configurations. Ligand binding resulted in the formation of hydridospirophosphorane structures, from which the molecular properties and binding geometry of these molecules could be explained by the theory of apicophilicity. Characterization was performed by NMR and IR spectroscopy as well as diffraction studies that provided the experimental crystal structures. The structural, energetic and spectroscopy results were compared to the theoretically obtained molecular properties using DFT analysis. Various interand intramolecular interactions that existed between molecules found in crystal packing environments were discussed. Additional properties that were investigated included modelling solvation effects, molecular orbital analysis, Hirshfeld surfaces, orbital and atomic energy and population analysis as well as ESP energy calculations with the optimized crystal structures as input. Molecular overlay comparisons were also performed between the experimental and optimized structures where the effectiveness of various DFT functionals and basis sets could be determined. The method with the best overall cost-to-accuracy ratio was found to be the triple-zeta def2-tzvp basis set with B3LYP functional theory and the addition of Grimme’s dispersion correction. Results indicated differences in crystal packing depending largely on the given halogen atoms present in the substituted phenyl rings, with differences observed in electronegativity and steric effects. One of the crystal systems showed additional interactions with solvent molecules, giving the impression that obtaining crystal void formation was possible. Alterations in the transition state activation energies between the isomers of each molecule were found to be present and supported the theory behind the mechanism of stereochemical induction. The studied compounds were therefore effective in isolating different enantiomeric ligands by means of energy differences between conformers and displayed unique catalytic properties resulting from the phosphorous main group element. The hydridospirophosphoranes conformers responsible for the lowest theoretically calculated activation energy induced crystallization as was seen by diffraction results for all compounds. Even as an intriguing observation, crystallization will largely depend on solubility rather than a specific conformer’s amount in solution.Thesis (MSc) -- Faculty of Science, School of Biomolecular and Chemical Sciences, 202
The socio-economic impact of communal property associations in O.R. Tambo district in the Eastern Cape
Get PDFLand is the most valuable resource in every nation since it supports all aspects of life by giving people food, shelter, and water. In South Africa, the legacy of the colonial past remains with ongoing poverty, landlessness, inequality, and insecurity to this day. Large tracts of property are still owned by the minority who benefited from apartheid colonialism, the land issue continues to be a major concern in South African politics. After 1994 the Department of Land Affairs released a White Paper on Land Reform that served as the model for many subsequent land reform initiatives, including land restitution. Former Bantustans contain a sizable quantity of unsurveyed land that is kept in trust and administered by traditional leaders who serve as custodians. In order to return the land to its rightful owners through land restitution as well as other land reform initiatives, the government established a legal organization, the Communal Property Association (CPA), against which the land could be registered. This study focuses on CPAs located on unsurveyed communal land in the Eastern Cape Province's OR Tambo District. There has been discussion in parliament and among academics about the effectiveness of CPAs in addressing socioeconomic needs. Various studies and departmental assessments have revealed that CPAs are not in compliance with the Act that governs them, and the Department of Agriculture, Rural Development, and Land Reform developed a regularization intervention strategy to close administrative gaps in slow land transfer, membership, financial reporting, asset management, and accountability. This study investigates whether CPAs provide socioeconomic benefits, and assesses their current practicability. Five CPAs were sampled, each located in different towns in the OR Tambo District of the Eastern Cape. The findings are that while there has been a socio-economic impact in the broader community where CPAs are located there has been limited benefit to intended beneficiaries. CPAs and their administration are in dire need of change. Too large CPA groupings, a lack of understanding of the constitution, a lack of business skills, a lack of asset management, corrupt transactions on CPA land, traditional leadership interference, delays in land surveying and transfer, a lack of government support, and land invasions are all challenges. The government needs to prioritize land surveying and transfer to beneficiaries in order to reduce land invasions and conflicts with traditional leaders.Thesis (MA) -- Faculty of Faculty of Business and Economic Sciences, 202
Social entrepreneurship and the tensions between social, environmental, and business goals: a case of Uganda
Get PDFClimate change has resulted in a global environmental crisis, with deforestation, plastic pollution, soil degradation, and species extinction increasing. Businesses have contributed significantly to these issues through their manufacturing processes. While many companies have implemented sustainability initiatives, systemic environmental problems persist, and businesses continue to play a significant role. One reason for this is that profit often takes priority over environmental considerations, limiting the effectiveness of sustainability programs. In response, environmental social enterprises are gaining prominence as a potent alternative to conventional business models. These enterprises are commended for placing environmental value generation at their core. Nevertheless, the simultaneous pursuit of financial, socio-economic, and environmental goals can instigate conflicts, including those related to performing, organizing, belonging, learning, and those spanning various levels of analysis. These conflicts impede the intended outcomes of these enterprises. This challenge is particularly under-addressed within contexts distinct from North America and Europe, like Uganda, which possesses unique geographic, political, and cultural attributes. Investigating how environmental social enterprises in Uganda navigate goal-related contradictions is pivotal for comprehending their internal mechanisms and strategies for economic sustainability. This study adopted a qualitative research strategy grounded in the interpretivist paradigm. Employing multi-qualitative methods, including interviews with 20 key decision-makers from 4 environmental social enterprises, the study delved into their experiences and practices. The findings revealed that these enterprises grapple with tensions stemming from their endeavors to balance economic, environmental, and social objectives. These tensions manifest both anticipated and unanticipated effects on organizational performance. Strategies for managing these tensions encompass collaborations with other organizations, experimentation with diverse management approaches, and acknowledging tensions as inherent and potentially beneficial. Nevertheless, the efficacy of these strategies hinges on the organizational context and systemic factors such as government regulations. While facing similar tensions, environmental social enterprises also adopt varied tactics—proactive, defensive, or a combination thereof—to address conflicts rooted in their goals. The chosen response method holds implications for ecological outcomes, underscoring the importance of framing tensions appropriately. Nonetheless, persistent tensions that resurface due to their dynamic nature pose a challenge. Consequently, addressing such tensions necessitates an iterative approach, often entailing a fusion of strategies. To address tensions between social, environmental, and economic objectives in environmental social enterprises, policymakers, governments, and social entrepreneurs should collaborate to institute supportive policies, encourage partnerships, invest in education and capacity building, and establish evaluation frameworks. Implementing these recommendations can adeptly manage such conflicts, fostering sustainable development and success.Thesis (MCom) -- Faculty of Commerce, Rhodes Business School, 202
Prosecution of forced marriage by international courts and tribunals in light of the principle of legality
No full textThesis embargoed. Probable release date in 2024.Thesis (LLM) -- Faculty of Law, Law, 202
Corporate failure and ethical resources: a case study of Steinhoff and Carillion
Get PDFThis study aimed to investigate the impact of disregarding ethical resources on company performance, with a particular focus on Carillion and Steinhoff as case studies. A pragmatist research philosophy was employed using a mixed methods approach, utilizing deductive inferencing to produce archival research. Data was collected from annual financial statements and existing literature on Steinhoff and Carillion's corporate failures. Both content analysis and statistical analysis were employed to analyse the data. The study found that both Carillion and Steinhoff were at the top of their respective industries when they began to underperform due to poor governance. On the part of Carillion, much of its failure can be attributed to aggressive bidding, while for Steinhoff, its failure was due to unscrupulous accounting practices. Corruption and fraud at the top echelon of each of these respective companies began to trickle down to the bottom of the hierarchy. Additionally, Steinhoff used a two-tier board system that promotes information asymmetry between a management board and a supervisory board. This gave Steinhoff’s management board leverage to manipulate company reports and hide information from the supervisory board. Steinhoff equally violated the board’s independence by making former management executives part of the supervisory board, who could potentially be lenient to the management board due to past relationships. This was further exacerbated by the CEO duality, which contributed to Steinhoff’s lack of board independence. Furthermore, Steinhoff’s board was reported to have served as board members for a long time, eventually leading them to create a group culture that negatively affected its board’s independence. Different from Steinhoff, which lacked board independence and board diversity, at face value, Carillion appeared to have a predominantly independent board with diverse experience and external commitments. However, Carillion also lacked board independence in a different way, as some of its board members were previously employed by KPMG. KPMG was also the external auditor of Carillion. This created a scenario where Carillion and KPMG were conniving, which may have affected the objectivity of the external audits on financial performance. Further to this, the CEO held outsized power over the board, which could have also resulted in a lack of independence. This, in turn, facilitated corrupt behaviour within the organisation, which may have contributed to its corporate failure. iv The findings of the study highlight the following three conclusions: i) profits that are premised on reckless, irregular, and fraudulent business and accounting practices are not sustainable; ii) governance structures that do not adhere to sound corporate governance principles result in impaired board independence and negatively affect firm performance; and iii) companies that reach the pinnacle of their success through unethical conduct are ultimately short-lived.Thesis (MBA) -- Faculty of Commerce, Rhodes Business School, 202
Analysis of corporate failures: a case study of two South African banks
Get PDFThis study analysed the factors that contributed to the failure of Venda Building Society Mutual Bank (VBS) and African Bank Limited and the impact it had on their key stakeholders. The specific objectives of this study were to evaluate African Bank and VBS bank's operational risk management processes and controls, the role of ethical failures at VBS bank and African Bank; and assess how the failures affected their stakeholders. The population sample of the study included African Bank and VBS. The study adopted a qualitative research method. Existing reports from both African Bank and VBS were used to collect data. The study adopted a thematic data analysis method, which includes data coding and the development of themes. The data analysis framework was derived from a defined set of research propositions and seven (7) themes were derived from this analysis method. The failure in operational controls of both banks and ineffective risk management structures including unethical conduct by the executive management and board of VBS bank, irregular financial transactions and weakened external auditing function resulted in an unaccountable executive relationship and reckless lending decision-making. This research study will expand on the existing body of knowledge on the failures and near-failures of banks in the South African banking sector. The South African banking industry and its regulatory bodies will be better equipped to strengthen their corporate governance in risk controls to mitigate future collapses and near collapses of banks.Thesis (MBA) -- Faculty of Commerce, Rhodes Business School, 202
Exploring ESL teachers’ self-developed pedagogical practices for teaching reading comprehension in Namibian primary schools
No full textEmbargoed. Possible release date 2026 pending publication.Thesis (MEd) -- Faculty of Education, Secondary and Post-School Education, 202
Fire disaster management in South Africa: modelling and data analysis at national and local level of government
No full textEmbargoed. Possible release in 2026 pending publication.Thesis (MSC Pharm) -- Faculty of Pharmacy, 202
A compliance framework for IT governance adoption and use by state-owned entities in South Africa
Get PDFEmbargoed. Possible release date in early 2025.Thesis (PhD) -- Faculty of Commerce, Information Systems, 202
Ithumbu labantu abadala
No full textThe bead collar necklace represents tradition and culture, blending vibrant colours and intricate patterns that enchant the observer's eyes and spirit alike. It is meticulously crafted with bands of turquoise, navy, pink, and white beads, each thoughtfully placed to create a seamless tapestry of hues. Adding black pearls and white beads along the edges adds a touch of sophistication to this timeless piece. The presence of pink in the design symbolises a transition into maturity, signifying the wearer's status within the older age group. Embraced by men and women, this necklace transcends gender distinctions, serving as a unifying emblem of shared heritage and identity. As it adorns the necks of its wearers, it becomes a tangible expression of cultural pride and unity, interweaving threads of tradition and belonging that resonate across generations.Purchased from Mrs Joan BrosterForms part of: Walter Sisulu University Beadwork Collectio