Cobalt-catalyzed Divergent Markovnikov and Anti-Markovnikov Hydroamination
作者:Xiang-Gui Zhang、Zi-Xin He、Peng Guo、Zheng Chen、Ke-Yin Ye
DOI:10.1021/acs.orglett.1c03511
日期:2022.1.14
Catalytic hydroamination of the readily available alkenes is among the most straightforward means to construct diverse alkyl amines. To this end, the facile access to both regioselectivity, i.e., Markovnikov or anti-Markovnikov hydroamination, with minimum reaction-parameter alternation, remains challenging. Herein, we report a cobalt-catalyzed highly selective and divergent Markovnikov and anti-Markovnikov
LIQUID CRYSTAL COMPOUNDS AND METHOD FOR PREPARING THE SAME
申请人:Choi Kyung-Hee
公开号:US20110237849A1
公开(公告)日:2011-09-29
The present invention relates to a liquid crystal compound for liquid crystal display. More particularly, the present invention provides a vinylcyclohexylbenzene, its derivatives and the preparation method thereof where the present invention produces only trans-isomer by using Heck coupling reaction instead of Wittig reaction in the introduction to ethenyl group in the central backbone in the preparation process of intermediate. The liquid crystal compound can make the liquid crystal composition have a wide mesophase range and low viscosity.
Intermolecular Metal‐Free Cyclopropanation and Aziridination of Alkenes with XH
<sub>2</sub>
(X=N, C) by Thianthrenation**
作者:Ming‐Shang Liu、Hai‐Wu Du、Jian‐Fang Cui、Wei Shu
DOI:10.1002/anie.202209929
日期:2022.10.10
Herein, a general and practical protocol to aziridines and cyclopropanes using free XH2 (X=C or N) with alkenes by thianthrenation is presented under mild conditions. Free sulfonamides, amides, carbamates, amines, and acidic methylene with protons, are good precursors for three-membered ring formation, providing an attractive alternative for straightforward synthesis of aziridines and cyclopropanes
Synthesis of pentafluoro-λ6-sulfanyl substituted acetylenes for novel liquid crystals
作者:Maxim V. Ponomarenko、Nataliya Kalinovich、Yurii A. Serguchev、Matthias Bremer、Gerd-Volker Röschenthaler
DOI:10.1016/j.jfluchem.2011.08.011
日期:2012.3
Synthetic routes towards SF5-substituted acetylenes as novel liquid crystal molecules were studied. Key steps of the synthetic sequence were based upon radical addition of SF5Cl to double and triple bonds of the corresponding liquid crystal precursors followed by dehydrochlorination of the corresponding products. The physical properties of the new liquid crystals 10a–c were investigated.
Photocatalyzed ditrifluoromethylthiolation of alkenes with CF3SO2Na
作者:Fangming Chen、Lvqi Jiang、Chunyang Hu、Jie Liu、Wenbin Yi
DOI:10.1007/s11426-023-1781-6
日期:2024.2
Since the first report of sodiumtrifluoromethanesulfinate (CF3SO2Na) as an electrophilic trifluoromethylthiolation reagent in 2015, there has been no breakthrough in research in this field. Herein, we disclose an unprecedented usage of CF3SO2Na as a radical trifluoromethylthiolation reagent. A photocatalyzed ditrifluoromethylthiolation of alkenes with CF3SO2Na in the presence of PPh3 and catalytic
自2015年首次报道三氟甲亚磺酸钠(CF 3 SO 2 Na)作为亲电三氟甲基硫基化试剂以来,该领域的研究一直没有突破。在此,我们公开了CF 3 SO 2 Na作为自由基三氟甲硫基化试剂的前所未有的用途。已经开发出在 PPh 3和催化铜存在下用 CF 3 SO 2 Na光催化烯烃的二三氟甲硫基化反应。有趣的是,Ir[(p-Fppy) 2 (bpy)]PF 6或 Ir(ppy) 3都可以促进这种转变。机理研究表明自由基链的引发是通过两种不同的光催化猝灭机制进行的。该协议为构建多种邻位二三氟甲硫基化合物提供了一种实用方法。