kinetically inert in cross-coupling reactions compared to those of carbon–halogen bonds. Thus, developing methodologies for the activation of CO bonds in cross-coupling reactions remains a major challenge. We disclose an unprecedented nickel mediated cross-coupling of carbamates with silylmagnesium reagents that does not require the expensive silylboranes. Silylmagnesium reagents were prepared from either silyllithium
Hierarchical Corannulene‐Based Materials: Energy Transfer and Solid‐State Photophysics
作者:Allison M. Rice、W. Brett Fellows、Ekaterina A. Dolgopolova、Andrew B. Greytak、Aaron K. Vannucci、Mark D. Smith、Stavros G. Karakalos、Jeanette A. Krause、Stanislav M. Avdoshenko、Alexey A. Popov、Natalia B. Shustova
DOI:10.1002/anie.201612199
日期:2017.4.10
We report the first example of a donor–acceptor corannulene‐containing hybrid material with rapid ligand‐to‐ligand energytransfer (ET). Additionally, we provide the first time‐resolved photoluminescence (PL) data for any corannulene‐based compounds in the solid state. Comprehensive analysis of PL data in combination with theoretical calculations of donor–acceptor exciton coupling was employed to estimate
我们报告了第一个具有快速配体-配体能量转移(ET)的供体-受体含球环烯杂化材料的例子。此外,我们还提供了任何固态 Corannulene 化合物的首次时间分辨光致发光 (PL) 数据。PL 数据的综合分析结合供体-受体激子耦合的理论计算用于估计所制备材料的 ET 速率和效率。使用两个模型计算的配体到配体的 ET 速率与在含富勒烯材料中观察到的结果相当,后者通常被认为用于分子电子学的开发。因此,所提出的研究不仅证明了将 π 碗(特别是 Corannulene 衍生物)的内在特性与晶体杂化支架的多功能性相结合的可能性,而且还预示着一类新型的基于 Corannulene 的分级杂化材料的工程设计。光电器件。
[2.2.2.2](2,7)‐1‐Bromonaphthalenophane from a Desymmetrized Building Block Bearing Electrophilic and Masked Nucleophilic Functionalities
naphthalenophanes with desymmetrized naphthalene cores as inherently chiral cyclophanes, nucleophilic substitution of 1‐bromo‐7‐(bromomethyl)‐2‐[(trimethylsilyl)methyl]naphthalene, a desymmetrized building block bearing an electrophilic group (CH2Br) and a masked nucleophilic functionality (CH2TMS) which can be activated by fluoride anion, was examined. As a result, in contrast to the case of parent naphthalenophanes
Reductive Cleavage of Aryl <i>O-</i>Carbamates to Phenols by the Schwartz Reagent. Expedient Link to the Directed <i>Ortho</i> Metalation Strategy
作者:Justin Morin、Yigang Zhao、Victor Snieckus
DOI:10.1021/ol401547d
日期:2013.8.16
efficient method for the reductive cleavage of aryl O-carbamates to phenols, 1 → 2 using the Schwartz reagent is reported. The method is selective, tolerating a large number of functional groups; may be carried out by direct or by an economical in situ procedure; and, notably, establishes a synthetic connection to the directedorthometalationstrategy (Figure 1) allowing new entries into difficult to