Synthesis and solid state structural analysis of conformers of tetrakis((ethoxycarbonyl)methoxy)tetrathiacalix[4]arene


Akdas H. , Mislin G., Graf E., Hosseini M., De Cian A., Fischer J.

TETRAHEDRON LETTERS, vol.40, no.11, pp.2113-2116, 1999 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Volume: 40 Issue: 11
  • Publication Date: 1999
  • Doi Number: 10.1016/s0040-4039(99)00143-4
  • Title of Journal : TETRAHEDRON LETTERS
  • Page Numbers: pp.2113-2116

Abstract

The role of alkaline metal cations in the synthesis and in determining the conformer distribution of tetrakis((ethoxycarbonyl)methoxy)tetrathiacalix[4]arene obtained by treatment of tetrathiacalix[4]arene 1 in acetone by ethyl bromoacetate in the presence of M2CO3 was systematically investigated. Among the four possible conformers, the cone, partial cone and 1,3-alternate conformers were obtained, purified and structurally characterised by X-ray analysis in the solid state. Although for Li+ no tetra substituted derivative was observed, for Na+ the cone conformer was exclusively formed while for both K+ and Cs+ a mixture of partial cone and 1,3-alternate conformers was obtained. (C) 1999 Elsevier Science Ltd. All rights reserved.