Regio- and diastereo-controlled synthesis of bis(formylmethano)[60]fullerenes and their application to the formation of [60]fullerene pearl-necklace polyimines
摘要:
The tether-directed method was firstly applied to the biscyclopropanation of [60]fullerene via the addition-elimination reaction of bis(sulfonium ylide)s to give bis(formylmethano)[60]fullerenes with satisfactory regio- and stereoselectivity. The equatorialbisadduct thus obtained was used for the polycondensation with an aromatic diamine to afford the corresponding pearl-necklace polyimine with satisfactorily high degree of polymerization. (c) 2006 Elsevier Ltd. All rights reserved.
Anion Recognition and Cation-Induced Molecular Motion in a Heteroditopic [2]Rotaxane
作者:Alexandre V. Leontiev、Charlotte A. Jemmett、Paul D. Beer
DOI:10.1002/chem.201002405
日期:2011.1.17
A heteroditopic [2]rotaxane consisting of a calix[4]diquinone–isophthalamide macrocycle and 3,5‐bis‐amide pyridinium axle components with the capability of switching between two positional isomers in response to barium cation recognition is synthesised. The anion binding properties of the rotaxane’s interlocked cavity together with Na+, K+, NH4+ and Ba2+ cation recognition capabilities are elucidated
A helically chiral [2]rotaxane featuring two ammonium ion recognition sites in the dumbbell-like component and a calix-bis-crown ether as the macrocyclic component was synthesized, but with no chirality in either individual component. The enantiomeric nature of the isomers, separated through chiral HPLC, was apparent in their CD spectra, which were mirror images for all wavelengths.
macrocyclic transition metal complexes of CuII and NiII, with bridging polyether linkers joining them to aromatic fragments, has been synthesised and their crystal and molecular structures have been established by single-crystal X-ray diffraction. These molecules adopt an “equatorial” conformation of the bridge due to formation of C–H···πinteractions. Because of these interactions only cyclic products are
已经合成了一系列 CuII 和 NiIII 的中性大环过渡金属配合物,桥接聚醚接头将它们连接到芳族片段,并通过单晶 X 射线衍射确定了它们的晶体和分子结构。由于形成C-H···π相互作用,这些分子采用桥的“赤道”构象。由于这些相互作用,在 SN2 反应中仅形成环状产物。DFT 计算也证实了实验结果。
A [2]catenane containing an upper-rim functionalized calix[4]arene for anion recognition
作者:Dale E. Phipps、Paul D. Beer
DOI:10.1016/j.tetlet.2009.02.212
日期:2009.7
A novel [2]catenane is synthesized in good yield from an upper-rim functionalized calix[4]arene macro-bicycle and a nitro-substituted isophthalamide threading component in the presence of a chloride anion template via a ring-closing metathesis (RCM) reaction. After halide anion template removal the resulting catenane host exhibits a high degree of selectivity for chloride in competitive organic solvent mixtures. (C) 2009 Elsevier Ltd. All rights reserved.
Regio- and diastereo-controlled synthesis of bis(formylmethano)[60]fullerenes and their application to the formation of [60]fullerene pearl-necklace polyimines
作者:Hiroshi Ito、Yasuhiro Ishida、Kazuhiko Saigo
DOI:10.1016/j.tetlet.2006.02.148
日期:2006.5
The tether-directed method was firstly applied to the biscyclopropanation of [60]fullerene via the addition-elimination reaction of bis(sulfonium ylide)s to give bis(formylmethano)[60]fullerenes with satisfactory regio- and stereoselectivity. The equatorialbisadduct thus obtained was used for the polycondensation with an aromatic diamine to afford the corresponding pearl-necklace polyimine with satisfactorily high degree of polymerization. (c) 2006 Elsevier Ltd. All rights reserved.