2,3-二取代的苯并[ b ]呋喃很容易在很温和的反应条件下通过钯/铜催化的各种邻碘苯甲醚和末端炔的交叉偶联反应,然后用I 2,PhSeCl或p-进行亲电环化而制得。 O 2 NC 6 H 4 SCl。芳基和乙烯基取代的炔烃以优异的收率进行亲电子环化。生物学上重要的呋喃吡啶可以通过这种方法以高产率制备。
The influence of crystal packing on the solid state fluorescence behavior of alkyloxy substituted phenyleneethynylenes
作者:Reji Thomas、Shinto Varghese、G. U. Kulkarni
DOI:10.1039/b902937k
日期:——
The study reports the solid state photophysical properties of a series of alkyloxy-substituted oligo(phenyleneethynylene)s, methoxy to hexyloxy, supported by a detailed analysis of molecular packing obtained from single crystal X-ray diffraction data. While the emission peaks are highly red shifted (by as much as 114 nm) in the solid state, all molecules exhibit similar absorption and emission in dilute solutions. The red shift is maximum in ethoxy and minimum in methoxy, while other crystalline films exhibit intermediate values. In the crystal structures, the spacing between the molecular pairs forming the J-aggregates is varied between 3.48 to 4.65 Å, with no systematic dependence on the chain length. The red shifted emission maximum is found to vary linearly with the spacing between the interacting molecules in the J-aggregate. Thus, the emission in the solid state is determined by the extent of dipolar coupling between the molecules, the alkyl chain length influencing the properties only indirectly.
On/off electrochemical switches based on quinone-bisketals
作者:Noelia Fuentes、Luis Álvarez de Cienfuegos、Andrés Parra、Duane Choquesillo-Lazarte、Juan M. García-Ruiz、M. Luisa Marcos、Elena Buñuel、Maria Ribagorda、M. Carmen Carreño、Diego J. Cárdenas、Juan M. Cuerva
DOI:10.1039/c0cc04388e
日期:——
The synthesis and anodic oxidation of a variety of 2,5-diaryl or dialkynylaryl substituted 1,4-dialkoxybenzenes to quinone bisketals is described. The study of the X-ray structures and electrochemical and spectroscopic properties evidenced that these pairs constitute a first approach to the concept of a molecular nanofuse.
FeCl<sub>3</sub>-Diorganyl Dichalcogenides Promoted Cyclization of 2-Alkynylanisoles to 3-Chalcogen Benzo[<i>b</i>]furans
作者:Rafaela M. Gay、Flávia Manarin、Caroline C. Schneider、Daniela A. Barancelli、Michael D. Costa、Gilson Zeni
DOI:10.1021/jo101126q
日期:2010.8.20
2-alkynylanisoles, via FeCl3/diorganyl dichalcogenides intramolecular cyclization, has been developed. Aryl and alkylgroups directly bonded to the chalcogen atom were used as cycling agents. The results revealed that the reaction significantly depends on the electronic effects of substituents in the aromatic ring bonded to the selenium atom of the diselenide species. We observed that the pathway of reaction was
通过FeCl 3从容易获得的2-炔基苯甲醚中合成3-硫属元素苯并[ b ]呋喃/ diorganyl dichalcogenides分子内环化已得到开发。直接结合到硫属元素原子上的芳基和烷基用作循环剂。结果表明,该反应显着取决于与二硒化物物种的硒原子键合的芳环中取代基的电子效应。我们观察到反应途径对苯甲醚芳环中取代基的性质不敏感,因为给电子基团和吸电子基团均以相似的产率传递产物。此外,将得到的杂环被容易地通过使用与硫属/锂交换反应转化成更复杂的产品Ñ-BuLi,然后用醛截留锂中间体,以良好的产率提供所需的仲醇。
Polyarylene compounds, polymers thereof, and electroluminescence element using the same
申请人:Cho Hyun-Nam
公开号:US20050176915A1
公开(公告)日:2005-08-11
Disclosed are a polyarylene compound and polymers thereof, which can be used as core materials for an organic or polymeric electro-luminescence (EL) element or for other optical devices, a preparation method thereof, and an EL element using the same.