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American Chemical Society, Journal of Organic Chemistry, 6(62), p. 1788-1794, 1997

DOI: 10.1021/jo9619692

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Synthesis of C -Alkylcalix[4]arenes. 5. Design, Synthesis, Computational Studies, and Homodimerization of Polymethylene-Bridged Resorc[4]arenes

This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Treatment of tetraaIcohol 1 with glutaroyl (2a, n = 3), adipoyl (2b, n = 4), and pimeloyl (2c, n = 5) dichlorides in the presence of Et(3)N gave the corresponding double-spanned calix[4]resorcarenes 3a-c, in which the insertion of two polymethylene bridges led to the formation of a cavity-shaped architecture resembling a basket. NMR, X-ray, and molecular dynamic-studies showed that one of the two equivalent flattened-cones, which constituted the original cone conformation of 1, had been frozen in the basket derivative. In the solid state the calixarene 3b exists as a supramolecular dimer, in which one of the handles is inserted in the concave cavity of an adjacent molecule. A molecular modeling study revealed that the minimum absolute free energy was associated to the unsymmetrical type of dimer named AB-AC.