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
Hydrotrifluoromethylthiolation of Unactivated Alkenes and Alkynes with Trifluoromethanesulfonic Anhydride through Deoxygenative Reduction and Photoredox Radical Processes
作者:Yao Ouyang、Xiu‐Hua Xu、Feng‐Ling Qing
DOI:10.1002/anie.201911323
日期:2019.12.16
trifluoromethanesulfonic anhydride (Tf2 O) as a radical trifluoromethylthiolating reagent. Hydrotrifluoromethylthiolation of unactivatedalkenes and alkynes with Tf2 O in the presence of PMePh2 and H2 O under visible-light photoredox catalysis gave the addition products. The trifluoromethylthio radical (. SCF3 ) was first formed from Tf2 O through a photoredox radical processes and deoxygenative reduction of
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.
Reported is the generation of aromatic N-heterocyclic radicals and their application in hydroamination, amidosulfenylation and bromoamination of unactivated alkenes. The resulting alkylated N-heterocyclic amines serve as important and versatile scaffolds that can be easily transformed into diverse functionalized molecules. Experimental data on the mechanism are presented.