Chemical processing is a prolific field in South Africa’s National Research and Development Strategy and catalysis is central to the chemical industry, being fundamental to the production of value-added materials. With feedstocks such as alkanes and alkenes readily available, there is a need for the design and synthesis of new, more efficient and selective catalysts which will allow for conversion into more useful products and add value to hydrocarbon products. South Africa is also one the largest suppliers of Platinum Group Metals world-wide and there is a drive to find useful, value-added applications for these metals.
However, with the depletion of available PGM resources and the added expense of these metals, PGM recovery and sustainability remains a key issue for researchers. Over the past few years, our group has been involved in immobilising catalysts on polymeric/dendritic supports and in biphasic media. This not only combines the advantages of homogeneous and heterogeneous catalysis but allows for ease of separation of the reaction product from rreaction mixtures, facilitating recycling of the catalysts to avoid environmental toxicity and makes purification of products easier. The multinuclear catalysts may also display enhanced activity over mononuclear analogues. Applications of this work have been extended to various organic transformation reactions, in particular, hydroformylation and carbon-carbon coupling reactions.
Shepherd Siangwata, Nadia Baartzes, Banothile C.E. Makhubela and Gregory S. Smith
Synthesis, characterization and reactivity of water-soluble ferrocenylimine-Rh(I) complexes as aqueous-biphasic hydroformylation catalyst precursors
Leah C. Matsinha, Jincheng Mao, Selwyn F. Mapolie and Gregory S. Smith
Water-Soluble Palladium(II) Sulfhonated Thiosemicarbazone Complexes: Facile Synthesis and Preliminary Catalytic Studies in the Suzuki-Miyaura Cross-Coupling Reaction in Water
Latisa Maqeda, Banothile C.E. Makhubela and Gregory S. Smith
Synthesis, characterization and evaluation of fluorocarbon-containing rhodium(I) complexes for biphasic hydroformylation reactions
Leah C. Matsinha, Selwyn F. Mapolie and Gregory S. Smith
Recoverable and Recyclable Water-Soluble Sulphonated Salicylaldimine Rh(I) Complexes for 1-Octene Hydroformylation in Aqueous Biphasic Media
Dalton Transactions, 2015, 44, 1240-1248. (Open Access)
Linhua Lu, Prinessa Chellan, Gregory Smith*, Xiang Zhang, Hong yan and Jincheng Mao*
Thiosemicarbazone salicylaldiminato palladium(II)-catalysed alkynylation couplings between arylboronic acids and alkynes or alkynyl carboxylic acids
Leah C. Matsinha, Peter Malatji, Alan T. Hutton, Gerhard A. Venter, Selwyn F. Mapolie and Gregory S. Smith
Water-Soluble Half-Sandwich Ru-Arene complexes: Synthesis, Structure, Electrochemistry, DFT Studies, and Aqueous Phase Hydroformylation of 1-Octene
Hong yan, Prinessa Chellan, Tingyi Li, Jincheng Mao, Kelly Chibale and Gregory Smith
Cyclometallated Pd(II) thiosemicarbazone complexes: new catalyst precursors for Suzuki-coupling reactions
Emma B. Hager, Banothile C.E. Makhubela and Gregory S. Smith*
Aqueous-phase Hydroformylation of 1-octene using hydrophilic sulfonate salicylaldimine dendrimers
Banothile C.E. Makhubela, Anwar M. Jardine, Gunnar Westman and Gregory S. Smith
Hydroformylation of 1-octene using low-generation Rh(I) Metallodendritic Catalysts based on a Tris-2-(2-pyridyliminoehtyl)amine scaffold
Banothile C.E. Makhubela, Anwar Jardine and Gregory S. Smith
Rh(I) Complexes Supported on a Biopolymer as Recyclable and Selective Hydroformylation Catalysts
Banothile C.E. Makhubela, Anwar Jardine and Gregory S. Smith.
Pd Nanosized Particles Supported on Chitosan and 6-Deoxy-6-Amino Chitosan as Recyclable Catalysts for Suzuki-Miyaura and Heck Cross-coupling Reactions.
Guanlei Xie, Prinessa Chellan, Jincheng Mao, Kelly Chibale and Gregory S. Smith
Thiosemicarbazone Salicylaldiminato-Palladium(II)-Catalyzed Mizoroki-Heck Reactions