The attachment of catalytic species to support materials is a widely applied method to combine the advantages of homogeneous and heterogeneous (supported) catalysis. The commonly used organic supports are insoluble polymeric materials, which have been developed with great success for solid phase organic synthesis and have a long history and importance. Obvious difficulties with these materials are their restricted loading capacity, the wettability issues, the often restricted accessibility of active (supported) sites, their reactivity or incompatibility towards reactive reagents, such as organometallics, and last but not least their high polydispersity. The use of soluble support materials can solve some of these problems, and for this reason soluble dendrimers have been explored as supports for homogeneous catalysts. Some of the advantages of dendrimers over many other types of macromolecules are their well defined structures and low polydispersity, good solubility in common organic solvents, and the presence of well-defined end-groups for the anchoring of catalytic species (see Chapter 1), all of which facilitate analysis of the (loaded) dendrimers often with atomic precision.
During the last decade, several reviews appeared describing the use of dendrimers as soluble supports for catalysts [1–11]. Among these, the silicon-based carbosilane dendrimers (see Chapter 3) assume a special position because of their structural robustness and stability towards highly reactive reagents. These are important prerequisites for any derivatization of the dendritic structure as well as for the introduction of catalytic metal sites, vide infra. Carbosilane dendrimers derive their kinetic and thermodynamic stability from the relatively high dissociation energy (306 kJ/mol) and low polarity of the Si—C bond [1]. The first demonstration of the potential of these unique properties was the successful synthesis of a carbosilane dendrimer 1 functionalized at its periphery with catalytically active NCN-pincer nickel catalysts (NCN = [C6H3(CH2NMe2)2−2,6]−) [12]. Due to their molecular size of about 2 nm, such catalytic species can be separated from the reaction solutions by nanofiltration, which in principle opens the way for recycling of the catalyst as well as for continuous use of such catalysts in membrane reactors.
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Wander, M., Gebbink, R.J., van Koten, G. (2009). Carbosilane Dendrimers: Molecular Supports and Containers for Homogeneous Catalysis and Organic Synthesis. In: Dvornic, P.R., Owen, M.J. (eds) Silicon-Containing Dendritic Polymers. Advances in Silicon Science, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-8174-3_9
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