Utilize este identificador para referenciar este registo: http://hdl.handle.net/10451/20898
Título: Synthesis, NMR conformational analysis, complexation and transport studies of an inherently chiral dihomooxacalix[4]arene triester
Autor: Marcos, PM
Ascenso, JR
Segurado, MAP
Pereira, JLC
Palavras-chave: Chemistry, Organic
Data: 2001
Editora: PERGAMON-ELSEVIER SCIENCE LTD
Citação: TETRAHEDRON. - Vol. 57, n. 32 (AUG 6 2001), p. 6977-6984
Resumo: The synthesis of the inherently chiral triethyl ester monomethyl ether of p-tert-butyldihomooxacalix[4]arene (3) is reported. A distorted cone conformation in solution at room temperature has been established for triester 3 by NMR measurements (H-1, C-13, NOE 1D and 2D). The extracting and complexing properties of 3 towards the entire alkali and alkaline earth cation series have been assessed by picrate extraction and stability constant determinations. Transport experiments with metal picrates through a CH2Cl2 membrane have also been performed. Comparison is made with tetraethyl ester of p-tert-butylcalix[4]arene (4) described in literature and also studied by us. 3 is a poor phase transfer agent and binder. In contrast, it is a good carrier, mainly for the alkali cations and displays a selective transport for Ba2+. (C) 2001 Elsevier Science Ltd. All rights reserved.
URI: http://hdl.handle.net/10451/20898
ISSN: 0040-4020
Aparece nas colecções:FF - Produção Científica 2000-2009

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