Hydrogen-bonded dimers of tetra-urea calix[4]arenes stable in THF

被引：24
|
作者：
Vatsouro, Ivan [1 ]
Rudzevich, Valentyn [1 ]
Bohmer, Volker [1 ]
机构：
[1] Univ Mainz, Abteilung Lehramt Chem, Fachbereich Chem, D-55099 Mainz, Germany
来源：
ORGANIC LETTERS | 2007年 / 9卷 / 07期
关键词：
D O I：
10.1021/ol0702775
中图分类号：
O62 [有机化学];
学科分类号：
070303 ; 081704 ;
摘要：
Whereas tetra-urea derivatives of tetra-alkoxy calix[4]arenes 1 exist as single molecules in THF, dimeric hydrogen-bonded capsules are exclusively found for the corresponding calix[4]arene derivatives 3 and 2 with two or four free hydroxyl groups. Comparison with the rigidified tetra-urea 5 suggests that this increased stability of the dimers is due to the stabilization of their four-fold symmetry by intramolecular hydrogen bonds between the phenolic hydroxyl groups.
引用
收藏
页码：1375 / 1377
页数：3
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