25, 25′, 27, 27′-Bis(1,3-dioxypropane)-bis(5, 11, 17, 23-tetra-tert-butylcalix[4]arene-26,28-diol) (4) and 25, 25′, 27, 27′-bis(1, 4-dioxybutane)-bis (5, 11, 17, 23-tetra-tert-butylcalix-[4]arene-26, 28-diol) (5) were synthesized by the reaction of p-tert-butylcalix[4]arene (1) with preorganized 25, 27-bis(3-bromoproxyl)calix[4]arene-26, 27-diol (2) and 25, 27-bis(3-bromobutoxyl)calix[4]arene-26, 27-diol (3) in the presence of K₂CO₃ and KI. Compounds 4 and 5 were characterized with X-ray analysis and the selectivity of 4 and 5 toward K⁺ over other alkali metal ions, alkaline metal ions as well as NH₄⁺ were investigated with an ion-selective electrode.

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Volume19, Issue5

May 2001

Pages 493-499

Synthesis and Structure of Novel Double Flexible Spacer Bridged Biscalix[4]arenes

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Synthesis and Structure of Novel Double Flexible Spacer Bridged Biscalix[4]arenes

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