A simple yet effective method for the formation of thiophene-fused π-systems is reported. When arylethynyl-substituted polycyclic arenes were heated in DMF in the presence of elemental sulfur, the corresponding thiophene-fused polycyclic arenes were obtained via cleavage of the ortho-C-H bond. Thus, arylethynylated naphthalenes, fluoranthenes, pyrenes, corannulenes, chrysenes, and benzo[c]naphtho[2
Synthesis and Structure of a Propeller-Shaped Polycyclic Aromatic Hydrocarbon Containing Seven-Membered Rings
作者:Kazuya Kawai、Kenta Kato、Lingqing Peng、Yasutomo Segawa、Lawrence T. Scott、Kenichiro Itami
DOI:10.1021/acs.orglett.8b00477
日期:2018.4.6
The synthesis and structure of a C3-symmetric propeller-shaped polycyclicaromatichydrocarbon that bears three seven-membered rings is reported. The synthesis was accomplished in three steps from benzo[c]naphtho[2,1-p]chrysene, including a Pd-catalyzed intramolecular C–H arylation for the formation of the seven-membered rings. The combination of the helicities (P/M) of the three seven-membered-ring
报道了带有三个七元环的C 3对称的螺旋桨状多环芳烃的合成和结构。从苯并[ c ]萘并[2,1- p ]丙烯在三个步骤中完成合成,包括钯催化的分子内C–H芳基化反应以形成七元环。三个七个七元环部分和三个[4] ic烯部分的螺旋度(P / M)的组合提供了24个可能的构象异构体,并且通过1 H NMR光谱观察到了两个相对稳定的构象。
作者:Kanna Fujishiro、Yuta Morinaka、Yohei Ono、Tsuyoshi Tanaka、Lawrence T. Scott、Hideto Ito、Kenichiro Itami
DOI:10.1021/jacs.3c01185
日期:2023.4.12
synthetic method for the preparation of polycyclic aromatic hydrocarbons, polycyclic heteroaromatic compounds, and nanographenes. Among the many examples, anionic cyclodehydrogenation using potassium(0) has attracted synthetic chemists because of its irreplaceable reactivity and utility in obtaining rylene structures from binaphthyl derivatives. However, existing methods are difficult to use in terms of practicality