Polyaromatic Ribbons from Oligo-Alkynes via Selective Radical Cascade: Stitching Aromatic Rings with Polyacetylene Bridges
摘要:
Selective radical generation in conjugated oligomeric o-aryleneethynylenes initiates an intramolecular cascade which involves five fast radical cyclizations followed by aromatization via a 1,5-H shift with a >93% yield per step. This radical cascade transformation opens a new avenue for the systematic and controlled preparation of functionalized graphene nanoribbons where, potentially, each of the peripheral aromatic rings can be different.
报道了一种混合分子开关,其包含围绕单个苯环的水杨基苯胺(SA)和二噻吩乙烯(DTE)部分。由于前者的溶剂辅助烯醇-酮互变异构与后者的光致变色电环化之间的相互作用,这种二噻吩基苯衍生物被发现在室温下具有光响应性,具有热稳定的闭合形式。主要光产物具有闭环 DTE 和酮-烯胺 SA 结构,可以通过可见光照射分离并转化回起始材料。通过使用密度泛函理论(DFT)计算来表征整个过程中涉及的潜在结构的光学性质,与测量数据非常吻合。转化的可逆性可以通过供体和受体取代基的存在来调节,而以苯并噻唑部分形式引入的亚胺甚至可以在非质子溶剂中实现光化学。
A New and Efficient Synthesis of 4-Functionalized Benzo[<i>b</i>]furans from 2,3-Dihalophenols
作者:Roberto Sanz、M. Pilar Castroviejo、Yolanda Fernández、Francisco J. Fañanás
DOI:10.1021/jo0508402
日期:2005.8.1
Tandem Sonogashira coupling/5-endo-dig cyclization reactions on 2,3-dihalophenols suppose a straightforward entry to 4-halobenzo[b]furans, which can be easily transformed into 4-functionalized benzo[b]furans, that are difficult to synthesize by other procedures. On the other hand, the starting 2,3-dihalophenols are efficiently prepared from commercially available 3-halophenols, via their N,N-diethyl
串联Sonogashira偶联/ 5-内切-挖上-2,3- dihalophenols环化反应假设一个简单的项,以4- halobenzo [ b ]呋喃,其可以容易地转化为4 -官能化苯并[ b ]呋喃,难以合成通过其他程序。另一方面,起始的2,3-二卤代苯酚是由市售的3-卤代苯酚经其N,N-二乙基氨基甲酸酯通过在低位用s -BuLi / TMEDA或LDA处理在2-位选择性锂化而有效制备的。温度和与卤素亲电子试剂的反应。
Synthesis of 4-functionalized-1H-indoles from 2,3-dihalophenols
作者:Roberto Sanz、Verónica Guilarte、Nuria García
DOI:10.1039/c004360e
日期:——
A new synthesis of 4-halo-1H-indoles has been developed from easily available 2,3-dihalophenol derivatives. The key steps are Smiles rearrangement and a one-pot or stepwise Sonogashira coupling/NaOH-mediated cyclization. Subsequent functionalization allows access to a wide variety of 2,4- or 2,3,4-regioselectively functionalized indoles.
Approaches to the Synthesis of 2,3-Dihaloanilines. Useful Precursors of 4-Functionalized-1<i>H</i>-indoles
作者:Verónica Guilarte、M. Pilar Castroviejo、Patricia García-García、Manuel A. Fernández-Rodríguez、Roberto Sanz
DOI:10.1021/jo200406f
日期:2011.5.6
2,3-Dihaloanilines have been proved as useful starting materials for synthesizing 4-halo-1H-indoles. Subsequent or in situ functionalization of the prepared haloindoles allows the access to a wide variety of 2,4- or 2,3,4-regioselectively functionalized indoles in good overall yields. As no efficient synthetic routes to 2,3-dihaloanilines have been described in the literature, different approaches
Modular Synthesis of Graphene Nanoribbons And Graphene Substructures From Oligo-Alkynes
申请人:The Florida State University Research Foundation,
公开号:US20130109855A1
公开(公告)日:2013-05-02
A method for the synthesis of carbon-based structures, particularly graphene substructures and ribbons, from oligo- and poly-alkyne starting materials.
MODULAR SYNTHESIS OF GRAPHENE NANORIBBONS AND GRAPHENE SUBSTRUCTURES FROM OLIGO-ALKYNES
申请人:The Florida State University Research Foundation, Inc.
公开号:US20150073145A1
公开(公告)日:2015-03-12
A method for the synthesis of carbon-based structures, particularly graphene substructures and ribbons, from oligo- and poly-alkyne starting materials.