Abstract
Enantioselection in a stoichiometric or catalytic reaction is governed by small increments of free enthalpy of activation, and such transformations are thus in principle suited to assessing “dendrimer effects” which result from the immobilization of molecular catalysts. Chiral dendrimer catalysts, which possess a high level of structural regularity, molecular monodispersity and well-defined catalytic sites, have been generated either by attachment of achiral complexes to chiral dendrimer structures or by immobilization of chiral catalysts to non-chiral dendrimers. As monodispersed macromolecular supports they provide ideal model systems for less regularly structured but commercially more viable supports such as hyperbranched polymers, and have been successfully employed in continuous-flow membrane reactors. The combination of an efficient control over the environment of the active sites of multi-functional catalysts and their immobilization on an insoluble macromolecular support has resulted in the synthesis of catalytic dendronized polymers. In these, the catalysts are attached in a well-defined way to the dendritic sections, thus ensuring a well-defined microenvironment which is similar to that of the soluble molecular species or at least closely related to the dendrimer catalysts themselves.
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Abbreviations
- ALB:
-
Al-Li-bis(binaphthoxide)
- BICOL:
-
9H,9′H-[4,4′]Bicarbazole-3,3′-diol
- BINAP:
-
2,2′-Bis(diphenylphosphino)-1,1′-binaphthyl
- BINOL:
-
1,1′-Bi-2-naphthol
- COD:
-
1,5-Cyclooctadiene
- Danishefsky's diene:
-
1-Methoxy-3-(trimethylsilyloxyl)buta-1,3-diene
- DPEN:
-
1,2-Diphenylethylenediamine
- ee:
-
Enantiomeric excess
- G x :
-
Generation x (1, 2, 3, …)
- Josiphos:
-
1-[2-(Diphenylphosphino)ferrocenyl]ethyldicyclohexyl-phosphine
- NOBIN:
-
2-Amino-2′-hydroxy-1,1′-binaphthyl
- PAMAM:
-
Poly(amido)amine
- PPI:
-
Poly(propyleneimine)
- Pyrphos:
-
3,4-Bis(diphenylphosphino)pyrrolidine
- salen:
-
Ethylenebis(salicylimine)
- TADDOL:
-
2,2-Dimethyl-α,α,α′,α′-tetraphenyl-1,3-dioxolane-4,5-dimethanol
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Kassube, J.K., Gade, L.H. (2006). Stereoselective Dendrimer Catalysis. In: Gade, L.H. (eds) Dendrimer Catalysis. Topics in Organometallic Chemistry, vol 20. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3418_032
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DOI: https://doi.org/10.1007/3418_032
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