A transition‐metal‐free catalytic hydrodefluorination (HDF) reaction of polyfluoroarenes is described. The reaction involves direct hydride transfer from a hydrosilicate as the key intermediate, which is generated from a hydrosilane and a fluoride salt. The eliminated fluoride regenerates the hydrosilicate to complete the catalytic cycle. Dispersion‐corrected DFT calculations indicated that the HDF
描述了多氟芳烃的无过渡金属催化加氢脱氟(HDF)反应。该反应涉及从氢硅酸盐作为主要中间体的氢化物直接转移,这是由氢硅烷和氟化物盐生成的。除去的氟化物使氢硅酸盐再生,从而完成催化循环。分散校正的DFT计算表明HDF反应通过协调的亲核芳族取代(CS N Ar)过程进行。
Synthesis and photochromic properties of a bis(diarylethene)-naphthopyran hybrid
作者:Firealem G. Erko、Liliana Cseh、Jérôme Berthet、Georg H. Mehl、Stéphanie Delbaere
DOI:10.1016/j.dyepig.2014.12.015
日期:2015.4
The synthesis and photochromicproperties of a triphotochromic molecule consisting of one naphthopyran flanked by two diarylethene units investigated by UV–Visible and Nuclear Magnetic Resonance spectroscopies are reported. Six different states resulting from the open/closed naphthopyran associated with one or two open/cyclized diarylethenes have been characterized. The photochemical and thermal interconversion
Photoswitchable Organic Mixed Valence in Dithienylcyclopentene Systems with Tertiary Amine Redox Centers
作者:Bice He、Oliver S. Wenger
DOI:10.1021/ja207025x
日期:2011.10.26
N-N distance, photocyclization of the dithienylperfluorocyclopentene core induces a changeover from class I to class II mixedvalence behavior. In the case of the shorter system, the experimental data is consistent with assignment of the photocyclized form to a class III mixedvalence species.
通过电化学和光谱方法研究了两个带有叔胺单元的二噻吩基全氟环戊烯分子的自由基阳离子的电子结构。两个系统的光环化(闭合)形式的直通键 NN 距离分别为 9.3 和 17.6 Å,具体取决于氮原子是直接连接到两个噻吩基单元还是二甲苯基间隔基之间。在具有较长 NN 距离的自由基阳离子的情况下,二噻吩基全氟环戊烯核的光环化诱导从 I 类到 II 类混合价行为的转变。在较短系统的情况下,实验数据与将光环化形式分配给 III 类混合价物种一致。