The first helicene structure was reported by Jakob Meisenheimer in 1903 as the reduction product of 2-nitronaphthalene. [10] [5]helicene was synthesized in 1918 by Weitzenböck & Klingler. [11]The first [6]helicene (also called hexahelicene) was synthesized by M. S. Newman and D. Lednicer in 1955 via a scheme that closed the two central rings by Friedel–Crafts cyclization of carboxylic acid ...

2011年10月24日 · π-Expanded [6]Helicene-Containing Nanographenes: Synthesis, Structures, and Chiroptical Properties. Organic Letters 2024 , Article ASAP. Yang Yu, Chang Wang, Faan-Fung Hung, Chen Chen, Ding Pan, Chi-Ming Che, Junzhi Liu .

2015年4月23日 · A new guideline for the design of precursor olefins resulted in the longest helicene synthesized to date. Abstract A single-strand arylene–vinylene precursor containing four phenylene and three naphthylene units linked together with six vinylene spacers undergoes helical folding via sextuple photocyclization to give a [16]helicene core in a ...

Helicene chemistry is being considered as an expanding and modern field, leading to several applications in supramolecular chemistry, in nanosciences, in chemical-biology, in polymers and materials science. This first part of a series of three reviews on carbohelicenes will be devoted to a comprehensive report on non-stereoselective reactions ...

His current research interests include supramolecular chemistry based on novel synthetic hosts, organic functional materials, and helicene chemistry. Yun Shen received his Ph.D. degree in organic chemistry under the supervision of Prof. Chen at ICCAS in 2014, where his research focused on the synthesis of helicenes and their applications in ...

Helicenes have attracted considerable attention due to their inherent helical chirality and extended π-conjugation. Recently, rapid progress has been witnessed in the preparation of double, triple, quadruple, quintuple, and sextuple helicenes, where plural helicene moieties are symmetrically arranged in a single molecule. While synthetic efforts and X …

2018年3月14日 · We report the synthesis and characterization of two hexapole [7]helicenes (H7Hs). Single crystal X-ray diffraction unambiguously confirms the molecular structure. H7H absorbs light, with distinct Cotton effect, from ultraviolet to the near-infrared (λmax = 618 nm). Cyclic voltammetry reveals nine reversible redox states, consecutively from −2 to +6. These chiroptical and electronic ...

2018年11月19日 · Herein we present the first hexapole [9]helicene (H9H).Co-catalyzed [2+2+2] cyclotrimerization of a dinaphthopyrene (DNP) functionalized alkyne provides the hexaaryl benzene precursor 2, which is transformed into H9H via a dehydrocyclization reaction. Formation of each embedded [9]helicene involves forging of a new C−C bond, which stitches together two [4]helicene subunits of the neighboring ...

螺烯（Helicene）是一类由芳环邻位稠合而成的具有独特螺旋手性的非平面多环芳烃化合物，凭借其扭曲的π共轭表面、固有的螺旋手性、良好的溶解性以及结构美学等特征，在化学与材料领域备受关注。然而，过去一个世纪的研究主要集中在合成具有更多芳香环和复杂异质结构的螺烯上，而 …

螺烯（Helicene）是一类由芳（杂）环邻位稠合而成的具有螺旋手性的非平面多环芳烃。 网页 新闻 贴吧 知道 网盘 图片 视频 地图 文库 资讯 采购 百科 百度首页