Tetrahedron Letters

A barium selective macrocyclic tetralactam with dimethyleneoxy moieties

L Cazaux, MC Duriez, C Picard, P Tisnes

Index: Cazaux, Louis; Duriez, Marie-Christine; Picard, Claude; Tisnes, Pierre Tetrahedron Letters, 1989 , vol. 30, # 11 p. 1369 - 1372

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Citation Number: 16

Abstract

Abstract Two new 18-membered tetralactams with two dimethyleneoxy moieties are synthesized by direct macrocyclization or steps reaction. In the latter case symmetrical or unsymmetrical compounds can be obtained. The unsymmetrical tetralactam shows a very high selectivity for barium vs. Na+ and Zn 2+ and to a lesser extent vs. K+, Mg 2+ and Ca 2+ in the extraction procedure with picrates. In addition, the stability constants are determined ...