Tetrahedron p. 1911 - 1924 (1991)
Update date:2022-08-04
Topics:
Zetta, Lucia
Wolff, Artur
Vogt, Walter
Platt, Karl-Ludwig
Boehmer, Volker
Several new chiral calix<4>arenes with three or four different substituents in the p-position have been prepared by fragment condensation.Standard derivation procedures always led to the formation of mixtures of various conformational isomeres from which the derivative in the cone-conformation could be isolated only by preparative HPLC.For a tetraester derivative it was shown by two-dimensional 1H NMR spectroscopy, that due to the different substituents the cone-conformation is strongly distorted.The sodium complex of this tetraester, however, assumes a regular cone-conformation again.
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