2232-08-8Relevant articles and documents
Facile synthesis of β-cyclodextrin-dextran polymers by "click" chemistry
Nielsen, Thorbjorn Terndrup,Wintgens, Veronique,Amiel, Catherine,Wimmer, Reinhard,Larsen, Kim Lambertsen
, p. 1710 - 1715 (2010)
Three series of novel water-soluble β-cyclodextrin-dextran polymers have been prepared by "click" chemistry. The polymers were synthesized from alkyne-modified dextrans (AMDs) onto which mono-6-O-deoxy-monoazido- βCD (N3βCD) was grafted by a copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC). The polymers have been characterized by NMR spectroscopy and size exclusion chromatography (SEC). The binding properties have been characterized by isothermal titration calorimetry (ITC) and show excellent accessibility of the βCDs.
Reactivity of nucleophiles towards X-3-(p-tolylsulfonyl)-1,2,3-benzoxathiazole 2,2-dioxides: Kinetics, activation volumes and mechanism
Andersen, Kenneth K.,Hubbard, Colin D.,Gerhard, Achim,Van Eldik, Rudi,Kociolek, Marting
, p. 175 - 181 (1997)
The kinetics of the reaction of four X-3-(p-tolylsulfonyl)-1,2,3-benzoxathiazole 2,2-dioxides (X=S-Cl, 5-Br, 5-NO2 and 6-NO2) with hydroxide ion and imidazole in aqueous acetonitrile and aqueous ethanol solutions were investigated at various pressures. The volumes of activation were all found to be negative and consistent with a bimolecular reaction involving considerable solvent electrostriction. No significant dependence on the solvent composition was found.
Water soluble homogeneous catalysts that are recoverable by phase selectivity and host-guest interactions
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Page/Page column 8, (2020/08/30)
A chemical reaction is catalyzed in an organic solvent using a water soluble N-heterocyclic carbene homogeneous catalyst to form a reaction mixture. An aqueous phase in the reaction mixture. A solvent in which the catalyst is insoluble is added to the reaction mixture, causing the catalyst to migrate to the aqueous phase to form a catalyst-laden aqueous phase. The catalyst is extracted from the catalyst-laden aqueous phase.
Reusable shuttles for exchangeable functional cargos: Reversibly assembled, magnetically powered organocatalysts for asymmetric aldol reactions
Mendoza, Carolina,de la Croix, Augustin,Riente, Paola,Llorens, Lluís,de Mendoza, Javier,Pericàs, Miquel A.
supporting information, (2019/09/17)
A supramolecular approach has been followed to support adamantyl substituted proline organocatalysts onto the surface of magnetite nanoparticles decorated with a β-cyclodextrin motif. The resulting magnetic nanoparticles (ca. ～10 nm diameter) were used as modular, magnetically recyclable catalysts in the asymmetric aldol reaction of aromatic aldehydes with cyclic ketones in water. The catalytic assemblies can be easily dismantled in organic media, and the recovered nanoparticles (magnetically powered chemical shuttles) re-complexed with another suitably substituted catalytic unit (replaceable functional cargo).
