chromospheres, with ferrocene as the electron donor and pyridinium as the electron acceptor, were synthesized. The nonlinear opticalabsorption (NOA) properties in the solution state were investigated by the Z-scan technique. Both compounds exhibited reverse saturable absorption (RSA) and optical limiting effect under nanosecond pulse irradiation.
The biological activity of naphtho[1,2‐d]oxazoles and heterobenz[1,2‐d]oxazoles prompted us to investigate the photochemical synthesis of substituted naphtho[1,2‐d/2,1‐d]oxazoles. The required p‐ and o‐phenyl‐substituted 5‐arylethenyloxazoles were prepared by the Van Leusen reaction. The substituted 4‐(aryl/heteroarylethenyl)oxazoles were prepared by the Wittig reaction.
萘并[1,2- d ]恶唑和杂苯并[1,2- d ]恶唑的生物活性促使我们研究取代的萘并[1,2- d / 2,1- d ]恶唑的光化学合成。所需的对-和邻-苯基取代的5-芳基乙烯基恶唑是通过Van Leusen反应制备的。取代的4-(芳基/杂芳基乙烯基)恶唑是通过Wittig反应制备的。
Flash vacuum pyrolysis of stabilised phosphorus ylides. Part 16. Model studies for the construction of conjugated polymers
作者:R.Alan Aitken、Martin J Drysdale、Lawrence Hill、Keith W Lumbard、James R MacCallum、Shirley Seth
DOI:10.1016/s0040-4020(99)00611-0
日期:1999.9
Reaction of a range of bis(ylides) with acid chlorides has been used to prepare the bis(oxoylides) 11–15. Similarly a range of simple ylides react with bis(acid chlorides) to give bis(oxoylides) 19–27 with the isomeric structure. Flashvacuumpyrolysis (FVP) of one example of the first type results in extrusion of Ph3P rather than the expected Ph3PO while six examples of the second type do extrude
一系列双(酰化物)与酰氯的反应已用于制备双(氧酰化物)11-15。同样,一系列简单的叶立德与双(酰氯)反应,生成具有异构体结构的双(氧酰)19-27。第一种类型的快速真空热解(FVP)导致Ph 3 P挤出,而不是预期的Ph 3 PO挤出,而第二种类型的六个实例确实在500°C的FVP压力下挤出Ph 3 PO以获得双(炔烃)28。还已经制备了相应的双(三丁基phosph)的实例,但是使用逐步方法构建四(氧代酰)31的尝试是失败的。完全分配给出了其中的六个双(氧酰化物)的13 C NMR光谱。
Thiolate-Initiated Synthesis of Dibenzothiophenes from 2,2′-Bis(methylthio)-1,1′-Biaryl Derivatives through Cleavage of Two Carbon–Sulfur Bonds
A catalytic reaction involving the cleavage of two carbon–sulfurbonds in 2,2′-bis(methylthio)-1,1′-biaryl derivatives is reported. This reaction does not require a transition-metal catalyst and is promoted by a thiolate anion. Notably, based on DFT calculations, the product-forming cyclization step is shown to proceed through a concerted nucleophilic aromatic substitution (CSNAr) mechanism.