Synthesis and solid state structure of oxacalix[4]arenes bearing four nitro groups and four tert

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• 作者：Shuichiro Akagi ; Yusuke Yasukawa ; Kazuhiro Kobayashi ; Hisatoshi Konishi
• 刊名：Tetrahedron
• 出版年：2009
• 出版时间：28 November 2009
• 年：2009
• 卷：65
• 期：48
• 页码：9983-9988
• 全文大小：576 K

文摘

Four oxacalix[4]arene derivatives, in which 1,3-dinitrobenzene units and 1,3-di-tert-butylbenzene units are incorporated in alternating order, were synthesized by aromatic nucleophilic substitution. The introduction of the tert-butyl groups increased the stability of the macrocycles against nucleophilic C–O bond cleavage. X-ray crystal structure analyses reveal that the oxacalixarenes adopt an unsymmetrical 1,3-alternate conformation. The bulky substituents did not disturb the conjugation between the bridging oxygen atoms and the dinitrobenzene rings.