Ditopic Calixcrowns with Inequivalent Crown Loops: Synthesis and Structural Characterisation of an Unsymmetrical Calix[4]arene biscrown-6
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- 作者：Zouhair Asfari ; Xavier Nicolle ; Jacques Vicens ; Jean-fran?ois Dozol ; Anne Duhart ; Jack M. Harrowfield ; Brian W. Skelton and Allan H. White
- 关键词：unsymmetrical ditopic calixcrown ; synthesis ; crystal structure
- 刊名：Journal of Inclusion Phenomena and Molecular Recognition inChemistry
- 出版年：1999
- 出版时间：1999
- 年：1999
- 卷：33
- 期：3
- 页码：251-262
- 全文大小：128 KB
文摘
Consecutive base-catalysed reactions of calix[4]arene with the ditosylates of two different polyetherdiols result in the relatively efficient production of an unsymmetrical calix biscrown-6 which, after reduction of an ethoxycarbonyl substituent to an hydroxymethyl group, has been characterised structurally by a room-temperature, single crystal X-ray study of its chloroform solvate. Crystals of ( 4), C53H62O13... 0.57CHCl3, are triclinic, P¯1, a 18.95(3), b 12.394(9), c 11.756(7) Å 106.93(5), 101.77(8), 94.63(8)°, Z = 2; R was 0.088 for 2231 observed' (I > 3(I)) diffractometer data.