Low-Valent Titanium Induced Carbonyl Coupling Reactions
- Authors: Jumbam, Ndze Denis
- Date: 2009
- Subjects: Carbonyl compounds -- Reactivity Carbonyl compounds
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/11260/812 , vital:29827
- Description: Interest in the use of low-valent titanium species as reagents in organic synthesis began with Van Tamelen and his research team in 1965, when they reported the first ever low-valent titanium-induced reductive dimerization of alcohols to give hydrocarbons [1]. In the early seventies shortly after the Van Tamelen report, the research teams of Mukaiyama,[2] Tyrlik[3] and McMurry[4] made the independent and simultaneous discovery that ketones and aldehydes undergo reductive dimerization to yield olefins on treatment with low-valent titanium reagents. Particularly McMurry and his co-workers [5,6,7] have extensively investigated this reaction, therefore this process is now generally referred to as the “McMurry reaction”.
- Full Text:
- Date Issued: 2009
- Authors: Jumbam, Ndze Denis
- Date: 2009
- Subjects: Carbonyl compounds -- Reactivity Carbonyl compounds
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/11260/812 , vital:29827
- Description: Interest in the use of low-valent titanium species as reagents in organic synthesis began with Van Tamelen and his research team in 1965, when they reported the first ever low-valent titanium-induced reductive dimerization of alcohols to give hydrocarbons [1]. In the early seventies shortly after the Van Tamelen report, the research teams of Mukaiyama,[2] Tyrlik[3] and McMurry[4] made the independent and simultaneous discovery that ketones and aldehydes undergo reductive dimerization to yield olefins on treatment with low-valent titanium reagents. Particularly McMurry and his co-workers [5,6,7] have extensively investigated this reaction, therefore this process is now generally referred to as the “McMurry reaction”.
- Full Text:
- Date Issued: 2009
Oesophageal Cancer in Transkei
- Authors: Stepien, Andrzej
- Date: 2009
- Subjects: Esophagus -- Cancer -- South Africa Stomach -- Cancer Cancer -- Patients
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/11260/769 , vital:29751
- Description: The oesophagus is a part of the digestive canal between the pharynx and the stomach. It is about 25 cm. long in adults. From inside, it is covered by multilayered squamous epithelium, separated by a basement membrane from deeper tissues that include submucosa, muscle layer and adventitia from outside. Two functional sphincters are located at both ends of the oesophagus, and some glands are present within its wall, which lubricate the surface by its mucin product, contributing to easier swallowing. Knowledge of those structures makes an easier understanding as to the occurrence of squamous cell carcinoma developing in the oesophagus, its spread; it also helps to understand the signs and symptoms of oesophageal carcinoma.
- Full Text:
- Date Issued: 2009
- Authors: Stepien, Andrzej
- Date: 2009
- Subjects: Esophagus -- Cancer -- South Africa Stomach -- Cancer Cancer -- Patients
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/11260/769 , vital:29751
- Description: The oesophagus is a part of the digestive canal between the pharynx and the stomach. It is about 25 cm. long in adults. From inside, it is covered by multilayered squamous epithelium, separated by a basement membrane from deeper tissues that include submucosa, muscle layer and adventitia from outside. Two functional sphincters are located at both ends of the oesophagus, and some glands are present within its wall, which lubricate the surface by its mucin product, contributing to easier swallowing. Knowledge of those structures makes an easier understanding as to the occurrence of squamous cell carcinoma developing in the oesophagus, its spread; it also helps to understand the signs and symptoms of oesophageal carcinoma.
- Full Text:
- Date Issued: 2009
A win-win situation in workplace participation by means of employee share ownership scheme
- Authors: Mazibuko, Noxolo Ellen
- Subjects: Employee ownership -- South Africa , Employee stock options -- South Africa
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/10948/21877 , vital:29797
- Description: This paper outlines the concept of Employee Share Ownership Participation Schemes known as ESOPs. An ESOP is not a simple concept and briefly entails that through ESOPs shares are made available to all employees who wish to participate in company decision-making and the company helps them to obtain the shares. South African share schemes are linked to economic empowerment. Some researchers emphasize that ESOPs in particular, hold the promise that employees will develop a sense of loyalty to their company because their material interest will coincide with those of the company (Maller, 1987; and Ottinger, 2008).
- Full Text: false
- Authors: Mazibuko, Noxolo Ellen
- Subjects: Employee ownership -- South Africa , Employee stock options -- South Africa
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/10948/21877 , vital:29797
- Description: This paper outlines the concept of Employee Share Ownership Participation Schemes known as ESOPs. An ESOP is not a simple concept and briefly entails that through ESOPs shares are made available to all employees who wish to participate in company decision-making and the company helps them to obtain the shares. South African share schemes are linked to economic empowerment. Some researchers emphasize that ESOPs in particular, hold the promise that employees will develop a sense of loyalty to their company because their material interest will coincide with those of the company (Maller, 1987; and Ottinger, 2008).
- Full Text: false
Instruments available to the public to assess audit quality
- Authors: Prinsloo, Frans
- Subjects: Auditing -- South Africa , Quality control -- Auditing , f-sa
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/10948/21928 , vital:29802
- Description: With the separation of ownership from day-to-day management that began to characterise many businesses following the industrial revolution, concern arose whether the day-to-day management (as agents) would bias information flows to the business owners (as principals) in order to enhance, say, their remuneration and their reputations as managers (AQF, 2005a: 6). To address these concerns, business owners require mechanisms, such as the external audit, to enable the effective assessment of the stewardship of the agents. Currently the role of the external auditor is to express an opinion on the fair representation of the annual financial statements prepared by management for the business owners.
- Full Text: false
- Authors: Prinsloo, Frans
- Subjects: Auditing -- South Africa , Quality control -- Auditing , f-sa
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/10948/21928 , vital:29802
- Description: With the separation of ownership from day-to-day management that began to characterise many businesses following the industrial revolution, concern arose whether the day-to-day management (as agents) would bias information flows to the business owners (as principals) in order to enhance, say, their remuneration and their reputations as managers (AQF, 2005a: 6). To address these concerns, business owners require mechanisms, such as the external audit, to enable the effective assessment of the stewardship of the agents. Currently the role of the external auditor is to express an opinion on the fair representation of the annual financial statements prepared by management for the business owners.
- Full Text: false
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