Dual Gold Catalysis: Synthesis of Fluorene Derivatives from Diynes
作者:Janina Bucher、Thomas Wurm、Svenja Taschinski、Eleni Sachs、David Ascough、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/adsc.201600987
日期:2017.1.19
one benzyl‐ or allyl‐substituted alkyne attached to an aromatic backbone were converted in the presence of a gold catalyst. In a dualgold‐catalyzed process, goldvinylidenes are formed that selectively undergo formal CH insertion into the C(sp2)–H bond of the offered unsaturated systems. If H atoms are present in the propargylic position, a subsequent isomerization to the aromatic system takes place
1,5 -二炔系统轴承连接到芳族主链一个末端和一个或苄基烯丙基取代的炔转化在金催化剂的存在下进行。在金的双重催化过程中,形成了亚乙烯基金,该亚乙烯基选择性地将正规的CH插入所提供的不饱和体系的C(sp 2)-H键中。如果在炔丙基位置存在H原子,则随后发生向芳族体系的异构化反应,最终生成9 H-芴和11 H-苯并[ b ]芴衍生物。对于在炔丙基位置的季碳,则未观察到进一步的芳构化,因此10 H-苯并[ b高产率地获得]芴衍生物。
CO Extrusion in Homogeneous Gold Catalysis: Reactivity of Gold Acyl Species Generated through Water Addition to Gold Vinylidenes
作者:Janina Bucher、Tim Stößer、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/anie.201409859
日期:2015.1.26
describe a new gold‐catalyzed decarbonylative indene synthesis. Synergistic σ,π‐activation of diyne substrates leads to gold vinylidene intermediates, which upon addition of water are transformed into gold acyl species, a type of organogold compound hitherto only scarcely reported. The latter are shown to undergo extrusion of CO, an elementary step completely unknown for homogeneousgoldcatalysis. By tuning
Gold Catalysis Meets Materials Science – A New Approach to π‐Extended Indolocarbazoles
作者:Christoph M. Hendrich、Lukas M. Bongartz、Marvin T. Hoffmann、Ute Zschieschang、James W. Borchert、Désirée Sauter、Petra Krämer、Frank Rominger、Florian F. Mulks、Matthias Rudolph、Andreas Dreuw、Hagen Klauk、A. Stephen K. Hashmi
DOI:10.1002/adsc.202001123
日期:2021.1.19
Herein we describe a modular, convergent synthesis of substituted benzo[a]benzo[6,7]‐indolo[2,3‐h]carbazoles (BBICZs) using a bidirectional gold‐catalyzed cyclization reaction as a key step. A building block strategy enabled the easy variation of substituents at different positions of the core structure and a general analysis of substitution effects on the materials properties of the target compounds
本文中,我们描述取代的苯并的一个模块化的,汇集合成[一个]苯并[6,7]吲哚并[2,3- ħ ]咔唑使用双向金催化环化反应中的关键步骤(BBICZs)。构造策略使核心结构不同位置的取代基容易变化,并且对目标化合物的材料性质的取代作用进行了一般分析。对所有BBICZ均进行了充分表征,并通过实验和计算方法研究了它们的光学和电子性能。通过真空沉积制造了基于八种选定衍生物的有机薄膜晶体管,并测量了高达1 cm 2 / Vs的载流子迁移率。
Molecular Propellers that Consist of Dehydrobenzo[14]annulene Blades
compound (4), which consisted of dehydrobenzo[14]annulene ([14]DBA) blades, as well as its naphtho homologues (5 and 6), have been prepared. Although NMR studies of compound 4 did not provide useful information regarding its conformation in solution, DFT calculations with different functionals and the 6‐31G* basis set all indicated that the D3‐symmetric structure was energetically more favorable than the
制备了一种新型的螺旋桨状化合物(4),它由脱氢苯并[14]环戊烯([14] DBA)叶片及其萘同系物(5和6)组成。尽管化合物4的NMR研究没有提供关于其在溶液中的构象的有用信息,但具有不同功能和6-31G *基集的DFT计算均表明D 3对称结构在能量上比C 2构象异构体更有利。根据X射线晶体学分析,似乎化合物4采用了螺旋形,大约D 3固态的对称结构,其中[14] DBA叶片基本上是由于相邻苯环之间的空间排斥而扭曲的。相反,在化合物6的情况下,尽管使用B3LYP官能团进行的DFT计算预测出D 3对称构象更稳定,但使用M05和M05-2X官能团进行的计算表明C 2构象异构体更有利,因为对相邻刀片的萘单元之间的π–π相互作用的关系。确实,化合物6的X射线分析表明它采用了近似C 2对称的构象。而且,在可变温度的基础上1 H NMR测量发现,化合物6采用C 2构象,C 2 - C 2构象异构体之间相互转化的势垒估计为16
Stable Monoareno-pentalenes with Two Olefinic Protons
作者:Péter J. Mayer、Gábor London
DOI:10.1021/acs.orglett.2c03752
日期:2023.1.13
A novel class of stable monoareno-pentalenes is introduced that have an olefinic proton on each five-membered ring of the pentalene subunit. Their synthesis was accomplished via a regioselective carbopalladation cascade reaction between ortho-arylacetyleno gem-dibromoolefins and TIPS-acetylene. These molecules could be experimental probes of magnetic (anti)aromaticity effects.