The synthesis and novel conformational properties of doubly and triply intrabridged calixarenes 1 and 2 are presented. Compound 1 is shown by VT-NMR and 2D EXSY NMR to exist in CDCl3 solution as a mixture of 1,2-alternate and cone conformers, while 2 adopts predominantly an asymmetrical conformation at temperatures below 235 K. Compound 1 in the solid state, determined by X-ray crystallography, exists in a very distorted cone-shaped conformation.
Synthesis and Conformational Properties of Proximally Dioxymethylene-intrabridged Calixarenes
NERI, Placido;
1992
Abstract
The synthesis and novel conformational properties of doubly and triply intrabridged calixarenes 1 and 2 are presented. Compound 1 is shown by VT-NMR and 2D EXSY NMR to exist in CDCl3 solution as a mixture of 1,2-alternate and cone conformers, while 2 adopts predominantly an asymmetrical conformation at temperatures below 235 K. Compound 1 in the solid state, determined by X-ray crystallography, exists in a very distorted cone-shaped conformation.File in questo prodotto:
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