79839-67-1Relevant academic research and scientific papers
Dual Effects of Cyclopentadienyl Ligands on Rh(III)-Catalyzed Dehydrogenative Arylation of Electron-Rich Alkenes
Lin, Weidong,Li, Weiwei,Lu, Dandan,Su, Feng,Wen, Ting-Bin,Zhang, Hui-Jun
, p. 8070 - 8076 (2018/08/01)
Despite extensive research on transition metal-catalyzed Fujiwara-Moritani type C-H olefinations, the alkenes used in these transformations are still mainly limited to active acrylate esters and styrenes. Selective aryl C-H olefination with electron-rich alkenes is recognized as a challenging issue. We herein report that simple and readily accessible electron-deficient [CpRh(III)] and [CpCF3Rh(III)] (CpCF3 = C5Me4CF3) complexes are powerful catalysts for dehydrogenative arylation of electron-rich alkenes, including vinyl acetates, enamides, and vinyl ethers. Employing an electron-withdrawing Cp or CpCF3 ligand instead of the privileged Cp? (C5Me5) ligand not only can facilitate the electrophilic aryl C-H rhodation but also can lower the olefin insertion barrier. Both electron-withdrawing and electron-donating directing groups such as -CONR2 and -NHAc could be employed in these reactions, which provides convenient routes toward a series styryl acetates, N-acetylindoles, and aryl methyl ketones.
Ruthenium-catalyzed ortho-C-H halogenations of benzamides
Wang, Lianhui,Ackermann, Lutz
supporting information, p. 1083 - 1085 (2014/01/17)
[Ru3(CO)12] and AgO2C(1-Ad) enabled the first ruthenium-catalyzed intermolecular halogenations of arenes via C-H activation. Thereby, brominations and iodinations of electron-rich and electron-deficient benzamides were ach
