Macrocyclic receptor molecules with a pendant carboxylic acid group for the complexation of urea

…, PDJ Grootenhuis, DN Reinhoudt…

Index: Aarts, Veronika M. L. J.; Grootenhuis, Peter D. J.; Reinhoudt, David N.; Czech, Anna; Czech, Bronislaw P.; Bartsch, Richard A. Recueil des Travaux Chimiques des Pays-Bas, 1988 , vol. 107, # 2 p. 94 - 104

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Citation Number: 10

Abstract

Abstract The synthesis of 5, 5′-di-tert-butyl-3-(carboxymethyl) biphenyl crown ethers and several lariat ethers with pendant carboxylic acid groups, together with the determinations of the pK a values of these crown ether carboxylic acids, are described. In addition, the complexation of urea by these crown ethers has been investigated. Both the larger-ring biphenyl crown ethers (≥ 29 ring atoms) and lariat ethers (≥ 27 ring atoms) solubilized ...