%0 Journal Article %A Lin, Weidong %A Li, Weiwei %A Lu, Dandan %A Su, Feng %A Wen, Ting-Bin %A Zhang, Hui-Jun %D 2018 %T Dual Effects of Cyclopentadienyl Ligands on Rh(III)-Catalyzed Dehydrogenative Arylation of Electron-Rich Alkenes %U https://acs.figshare.com/articles/journal_contribution/Dual_Effects_of_Cyclopentadienyl_Ligands_on_Rh_III_-Catalyzed_Dehydrogenative_Arylation_of_Electron-Rich_Alkenes/6911759 %R 10.1021/acscatal.8b01753.s001 %2 https://ndownloader.figshare.com/files/12634784 %K CONR %K series styryl acetates %K Rh %K olefin insertion barrier %K electron-withdrawing %K 4 CF 3 %K electron-rich alkenes %K aryl methyl ketones %K olefination %K Cp CF 3 %K C 5 %K Cp CF 3 ligand %X 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. %I ACS Publications