Synthesis and Solid-State Conformation of a Calix[8]arene 1,5-Diquinone Derivative |
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Authors: | Rossella Ferro Consiglia Tedesco Carmine Gaeta Placido Neri |
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Institution: | (1) Dipartimento di Chimica, Università di Salerno, Via S. Allende 43, I-84081 Baronissi (Salerno), Italy |
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Abstract: | The first example of a calix8]quinone derivative, hexamethoxy-p-tert-butylcalix8]-1,5-diquinone 5, has been synthesized from p-tert-butylcalix8]arene 1by exploiting a protection-deprotection procedure. The structure of the 5·toluene inclusion compound has been determined by a single crystal X-ray diffraction study. The calix8]arene molecule possesses a crystallographic inversion centre and assumes a ‘pseudo-chair-like’ conformation, with two opposite 3/4-cone moieties, which resembles the previously reported chair-like conformation of p-tert-butylcalix8]arene. The 4 toluene molecules per unit cell occupy interstitial voids and are released in the temperature range of 30–160 °C.This revised version was published online in July 2005 with a corrected issue number. |
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Keywords: | calix[8]arenes calixquinones chair-like conformation inclusion complex X-ray crystal structure |
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