Synthesis and crystallographic studies of a calix[4]arene with a 1,3-alternate conformation

Kiyoshi Fujimoto, Nobuaki Nishiyama, Hirohisa Tsuzuki, Seiji Shinkai

研究成果: Contribution to journalArticle査読

9 被引用数 (Scopus)

抄録

25,27- Bis(ethoxycarbonylmethoxy)-26,28-bis(2-pyridylmethoxy) -5,11,17,23-tetra-tert-butylcalix-[4]arene with a 1,3-alternate conformation (1,3-alternate-2) has been synthesized. Dynamic 1H NMR spectroscopy has established that the conformation is immobilized (i.e., the oxygen-through-the-annulus rotation is inhibited). The single crystal was grown from acetonitrile and analysed by X-ray crystallography. It was found that the structural characteristics of a 1,3-alternate conformation are (i) the four phenyl rings are more or less parallel to each other, the dihedral angles between the four phenyl rings and the mean plane of the four methylene groups being 93.5, 100.4, 101.4 and 106.1°, (ii) the ArCH2Ar bond angles are more expanded than those for other conformations and (iii) 1,3-alternate-2 in solution adopts C2 symmetry whereas in the solid state it is less symmetrical because of the unsymmetrical orientation of the ester and the pyridyl substituents. This is a rare example of the X-ray crystallographic analysis of 1,3-alternate calix[4]arenes.

本文言語英語
ページ(範囲)643-648
ページ数6
ジャーナルJournal of the Chemical Society, Perkin Transactions 2
4
DOI
出版ステータス出版済み - 1992

All Science Journal Classification (ASJC) codes

  • 化学 (全般)

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