Reversible dimerization of tetraureas derived from calix[4]arenes

被引：0
|
作者：
Böhmer, V [1 ]
Mogck, O [1 ]
Pons, M [1 ]
Paulus, EF [1 ]
机构：
[1] Univ Mainz, Inst Organ Chem, D-55099 Mainz, Germany
来源：
NMR IN SUPRAMOLECULAR CHEMISTRY | 1999年 / 526卷
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D O I：
暂无
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
Calix[4]arene derivatives, substituted at the wider rim by four urea functions are easily available in great variety. In apolar solvents like benzene or chloroform they dimerize via NH ... O=C hydrogen bonds encapsulating a single solvent molecule as guest. The exclusive formation of dimers has been proved in solution by NMR, while their shape has been characterized by single crystal X-ray analysis. The kinetic stability and the rate of the guest exchange have been studied by NOESY experiments using a derivative with lower symmetry.
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页码：45 / 60
页数：16
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