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Dendrimer Catalysis by Alexsandro Berger, Robertus J. M. Klein Gebbink, Gerard van

By Alexsandro Berger, Robertus J. M. Klein Gebbink, Gerard van Koten (auth.), Lutz H. Gade (eds.)

Since the 1st software of dendrimers in catalysis within the mid Nineteen Nineties, this box has complicated quickly. hence, catalytically energetic dendrimers have emerged as a category of molecular catalysts that has considerably enriched the sector of homogeneous (and partially heterogeneous) catalysis. A basic survey of transition steel dendrimer catalysts and how they've got built is via in-depth discussions of dendritic transition steel catalysis according to non-covalent catalyst-support interplay and an summary of the quickly growing to be box of stereoselective dendrimer catalysis. the improvement of dendrimer-encapsulated bimetallic nanoparticles has supplied the interface with heterogeneous colloid catalysis. As more cost-effective and effortlessly obtainable choices to ordinary dendrimers, hyperbranched polymers are more and more getting used as catalyst structures. those subject matters are complemented by means of a overview of metallodendritic exoreptors for the redox acceptance of oxo-anions and halides.

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In these assemblies, eight anionic organometallic Pd- Fig. 8 Stoichiometric assembly of an octa-cationic core-shell dendrimer and eight anionic Pd(II) guest molecules 50 F. Ribaudo et al. , the number of incorporated mono-anionic Pd(II)-guests is determined by the number of cationic sites in the dendrimer core. According to the NMR studies, the organometallic Pd(II) moieties are located at or around the dendrimer periphery depending on the tether size and the dendrimer generation. The diffusion coefficients of the octa-cation and the eight mono-anions in these dendritic assemblies show a good correlation and indicate an enhanced “entrapment” of the anions by the larger dendrimers.

44 Noncovalently Functionalized Dendrimers Based on Single Point Interactions . . . . . . . . . . . 49 5 Noncovalently Functionalized Hyperbranched Polymers . . . . . 52 6 Conclusions and Outlook . . . . . . . . . . . . . . 56 References . . . . . . . . . . . . . . . . . . . . 58 4 Abstract The development of catalytic systems that provide rapid and selective chemical transformations and can be completely separated form the product is still a major challenge.

According to the NMR studies, the organometallic Pd(II) moieties are located at or around the dendrimer periphery depending on the tether size and the dendrimer generation. The diffusion coefficients of the octa-cation and the eight mono-anions in these dendritic assemblies show a good correlation and indicate an enhanced “entrapment” of the anions by the larger dendrimers. These assemblies were successfully applied as Lewis acid catalysts in the cyclization of benzaldehyde and methyl isocyanate.

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