A Triangular Macrocycle Altering Planar and Bulky Sections in Its Molecular Backbone
摘要:
A triangular macrocyclic molecule has been synthesized which consists of substituted phenanthrene vertices interconnected by 1,3-diethynylbicyclo[1.1.1]pentane sides. The molecule is the very first example of exploiting the bicyclopentane motif in the construction of a shape persistent macrocycle's backbone. It carries new features such as bulkiness, nonconjugated sigma-bonding, and a certain conformational flexibility due to its easy longitudinal rotation. We have used some of the features in order to rationalize the observed tendency of the compound to form films on various surfaces.
Bicyclo[1.1.1]pentane-Derived Building Blocks for Click Chemistry
作者:Serhii O. Kokhan、Yevheniia B. Valter、Andriy V. Tymtsunik、Igor V. Komarov、Oleksandr O. Grygorenko
DOI:10.1002/ejoc.201701296
日期:2017.11.24
Syntheses of bicyclo[1.1.1]pentane-derived azides and terminal alkynes - interesting substrates for click reactions - are described. With a few exceptions, the title compounds were prepared in two or three steps starting from common synthetic intermediates - the corresponding carboxylic acids. The key step in the synthesis of 1-azidobicyclo[1.1.1]pentanes was a copper-catalyzed diazo transfer reaction
1,3-Diethynylbicyclo[1.1.1]pentane, a Useful Molecular Building Block
作者:Jiří Kaleta、Marek Nečas、Ctibor Mazal
DOI:10.1002/ejoc.201200351
日期:2012.9
that afford the corresponding dibromo and diiodo derivatives of DEBCP, which then successfully react with tert-C-cuprates derived from p- and m-dicarbadodecaboranes or bicyclopentanes. These umpolung reactions afforded a new class of molecular rods that combine carborane or bicyclo[1.1.1]pentane cages with ethynylene linkers. Many of the DEBCP derivatives were studied by single-crystal X-ray diffraction
Octacarbonyldicobalt and bis(dimethyl sulfide)decaborane B10H12(Me2S)2 were successfully added to 1,3-diethynylbicyclo[1.1.1]pentane in good yields. This is an interesting example of a cycloaddition reaction achieved next to the bicyclopentane cage that tends to rearrange in many other cases. It proves that both reagents attack the triple bond in a more or less concerted manner that prevents the rearrangement
八羰基二钴和双(二甲基硫醚)十硼烷B 10 H 12(Me 2 S)2已成功添加到1,3-二乙炔基双环[1.1.1]戊烷中。这是在双环戊烷笼子旁边实现的环加成反应的一个有趣例子,在许多其他情况下,该笼子倾向于重排。证明了这两种试剂或多或少地协同作用攻击了三键,从而防止了重排。后一反应的产物特别令人感兴趣,因为双环戊烷和邻-碳硼烷的笼子立即以其杆状结构连接。这样就构成了新型的分子转子。1 H和13溶液中的C核磁共振波谱揭示了具有明确定义的几何结构的分子的平均旋转对称性,这在几个示例中已通过X射线结构分析得到了证实。
Electrochemical test of flexibility of pyridine terminated molecular rods
A family of seven symmetrical molecularrods, which are sharing 4-ethynylpyridyl terminal groups and differ in the structure of the linker have been investigated. Although structurally related they show unique electrochemical behavior, which clearly correlates with their conformational flexibility. Two flexible compounds are reduced by two electrons. Their reduction yields intensive charge transfer