Mechanosynthesis of Odd‐Numbered Tetraaryl[
<i>n</i>
]cumulenes
作者:Karen J. Ardila‐Fierro、Carsten Bolm、José G. Hernández
DOI:10.1002/anie.201905670
日期:2019.9.9
A mechanochemical synthesis of one‐dimensional carbon allotrope carbyne model compounds, namely tetraaryl[n]cumulenes (n=3, 5) was realized. Central for the mechanosynthesis of the cumulenic carbon nanostructures were the development of a mechanochemical Favorskii alkynylation‐type reaction and the implementation of a solvent‐free, acid‐free reductive elimination with tin(II) chloride by ball milling
实现了一维碳同素异形体碳炔模型化合物,即四芳基[ n ]累积烯(n =3, 5)的机械化学合成。积碳碳纳米结构机械合成的核心是机械化学 Favorskii 炔基化反应的发展,以及通过球磨实现无溶剂、无酸的氯化锡 (II) 还原消除。
Synthesis of Dicyano-Substituted Benzo[c]fluorenes from Tetraaryl[3]cumulenes
作者:Przemyslaw Gawel、Elias A. Halabi、David Schweinfurth、Nils Trapp、Laurent Ruhlmann、Corinne Boudon、François Diederich
DOI:10.1002/ejoc.201600470
日期:2016.6
cycloadducts, which provides new 5,6-dicyanobenzo[c]fluorene derivatives in fair to good yields. Isolated intermediates and time-resolved EPR spectroscopy measurements support our mechanistic proposal. Furthermore, X-ray crystallographic proof for the postulated structures as well as for the reaction intermediates is provided. The optoelectronic properties of these new chromophores were derived from
Sulfurization and selenation reactions of 1,1,4,4-tetraaryl-1,2,3-butatrienes were examined to give novel 1,2,3,4,5-pentathiepane and 1,2,5-triselenepane ring systems. Further degradation of these new heterocycles using DBU/DMF was also described.
A four‐stepsynthesis of substituted 5,11‐dicyano‐6,12‐diaryltetracenes was developed, starting from readily available para‐substituted benzophenones. The key step of this straightforward route is the complex cascade reaction between tetraaryl[3]cumulenes and tetracyanoethene (TCNE) resulting in 5,5,11,11‐tetracyano‐5,11‐dihydrotetracenes. The mechanism of this transformation was reinvestigated by