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Synthesis, structure and conformational mobility of tetra-substituted cyanomethoxy p-tert-butylcalix[4]arenes

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Authors
D'Alessio, D.
Krause-Heuer, A.
Skelton, B.
Fraser, B.
Massi, Massimiliano
Ogden, Mark
Date
2016
Type
Journal Article

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D'Alessio, D. and Krause-Heuer, A. and Skelton, B. and Fraser, B. and Massi, M. and Ogden, M. 2016. Synthesis, structure and conformational mobility of tetra-substituted cyanomethoxy p-tert-butylcalix[4]arenes. RSC Advances. 6 (43): pp. 37006-37011.
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RSC Advances
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Nanochemistry Research Institute
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This open access article is distributed under the Creative Commons license http://creativecommons.org/licenses/by-nc/3.0/

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Abstract

The syntheses and single crystal X-ray structure determinations of 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis(cyanomethoxy)calix[4]arene (partial-cone conformer), 5,11,17,23-tetra-tert-butyl-25,27-bis(diethylcarbamoylmethoxy)-26,28-bis(cyanomethoxy)calix[4]arene (cone and partial-cone conformers), 5,11,17,23-tetra-tert-butyl-25,26,27-tris(cyanomethoxy)-28-hydroxycalix[4]arene, and 5,11,17,23-tetra-tert-butyl-25-diethylcarbamoylmethoxy-26,27,28-tris(cyanomethoxy)calix[4]arene (cone conformer) are reported. The calixarenes are found to be conformationally mobile when heated in DMSO, favouring the partial-cone conformer at equilibrium. The tris-substituted cyanomethoxy derivative was found to assume the partial-cone conformation in the solid state. Attempts to convert nitrile groups to tetrazole moieties in derivatives containing both amide and nitrile groups were unsuccessful.