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- W2011736620 abstract "Abstract The synthesis of 1,2- and 1,3-calix[4]-bis-crowns, double calix[4]arenes and double calixcrowns has been shown to depend on the reaction conditions (nature of the base, structure of the ditosylates, and the stoichiometry of the reactants). The 1,3-alternate conformation of the 1,3-calix[4]-bis-crowns was shown to be favourable to the selective complexation of caesium cations. The observed Na + /Cs + selectivity was exploited in separation processes by using them as carriers in transport through supported liquid membranes. The best Na + /Cs + selectivity (1/45 000) was observed for a napthyl-substituted derivative. Calix(aza)crowns and 1,3-calix[4]-bis(aza)-crowns were also produced through the preliminary formation of the corresponding Schiff-base calixarenes which were then further hydrogenated. The syntheses consisted of the 1,3-selective alkylation of the calixarenes, followed by cyclization into a 1,3-bridge via the direct 1,3-capping of the calixarene with the appropriate ditosylates. Soft metal complexation by these ligands is also presented." @default.
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- W2011736620 date "2010-08-17" @default.
- W2011736620 modified "2023-09-25" @default.
- W2011736620 title "ChemInform Abstract: New Complexing Macrocycles: The Calixcrowns" @default.
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- W2011736620 doi "https://doi.org/10.1002/chin.199543298" @default.
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