Thermal polymorphic transformation of p-tert-Butylcalix

Studies were made on the polymorphism of p-tert-butylcalix[4]arene derivatives having amino acid groups on the lower rim to stabilize their hydrophilic pseudocavity by circular intramolecular hydrogen bonding. The calixarenes exhibit a polymorphic transformation upon heating in the solid state. This...

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Bibliographic Details
Published inJournal of organic chemistry Vol. 65; no. 19; pp. 5932 - 5936
Main Authors Nomura, E, Takagaki, M, Nakaoka, C, Taniguchi, H
Format Journal Article
LanguageEnglish
Published United States 22.09.2000
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Summary:Studies were made on the polymorphism of p-tert-butylcalix[4]arene derivatives having amino acid groups on the lower rim to stabilize their hydrophilic pseudocavity by circular intramolecular hydrogen bonding. The calixarenes exhibit a polymorphic transformation upon heating in the solid state. This transformation is controlled by the thermal history of solids, accompanying the change on the conformation of the calixarene skeleton and also the change of hydrogen bonding in the hydrophilic pseudocavity.
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ISSN:1520-6904