(3+3)-Cyclocondensation of the enantiopure and racemic forms of trans-1,2-diaminocyclohexane with terephthaldehyde. Formation of diastereomeric molecular triangles and their stereoselective solid-state stacking into microporous chiral columns
作者:Martin Chadim、Miloš Buděšı́nský、Jana Hodačová、Jiřı́ Závada、Peter C. Junk
DOI:10.1016/s0957-4166(00)00494-8
日期:2001.2
The non-templated reaction of both the homochiral as well as the racemic form of trans-1,2-diaminocyclohexane with terephthaldehyde affords (3+3)-cyclocondensed molecular triangles in practically quantitative yields. The configuration of the diastereomeric products resulting in the individual reactions has been determined by H-1 and C-13 NMR spectroscopy. Unambiguous proof has been obtained by X-ray crystal structure analysis of both alternative diastereomers, revealing also a stereoselective stacking of the triangles into microporous chiral columns. (C) 2001 Elsevier Science Ltd. All rights reserved.
The application of quasi-enantiomeric trianglamine macrocycles as chiral probes for anion recognition in ion trap ESI mass spectrometry
作者:Nikolai Kuhnert、David Marsh、Daniel C. Nicolau
DOI:10.1016/j.tetasy.2007.07.011
日期:2007.7
This paper reports the synthesis and application of quasi-enantiomeric trianglamine macrocycles for chiral analysis using ion trap ESI mass spectrometry. The quasi-enantiomeric macrocycles were shown to display chiroselection towards a series of enantiomerically pure carboxylic acids and therefore act as chiral probes for anions in the gas phase and in solution. (c) 2007 Elsevier Ltd. All rights reserved.