Ligand functionalization as a deactivation pathway in a fac-Ir(ppy)3-mediated radical addition† †Electronic supplementary information (ESI) available. See DOI: 10.1039/c4sc03064h Click here for additional data file.
نویسندگان
چکیده
Knowledge of the kinetic behavior of catalysts under synthetically relevant conditions is vital for the efficient use of compounds that mediate important transformations regardless of their composition or driving force. In particular, these data are of great importance to add perspective to the growing number of applications of photoactive transition metal complexes. Here we present kinetic, synthetic, and spectroscopic evidence of the mechanistic behavior of fac-Ir(ppy)3 in a visible lightmediated radical addition to 3-methylindole, demonstrating the instability of fac-Ir(ppy)3 under these conditions. During the reaction, rapid in situ functionalization of the photocatalyst occurs, eventually leading to deactivation. These findings demonstrate a conceivable deactivation process for catalytic single electron reactions in the presence of radicophilic ligands. Attempts to inhibit photocatalyst deactivation through structural modification provide further insight into catalyst selection for a given system of interest.
منابع مشابه
Ligand functionalization as a deactivation pathway in a fac-Ir(ppy)3-mediated radical addition.
Knowledge of the kinetic behavior of catalysts under synthetically relevant conditions is vital for the efficient use of compounds that mediate important transformations regardless of their composition or driving force. In particular, these data are of great importance to add perspective to the growing number of applications of photoactive transition metal complexes. Here we present kinetic, sy...
متن کاملLigand-enabled Ir-catalyzed intermolecular diastereoselective and enantioselective allylic alkylation of 3-substituted indoles† †Electronic supplementary information (ESI) available. CCDC 1060973. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c5sc01772f Click here for additional data file. Click here for additional data file.
متن کامل
Near-IR absorbing donor–acceptor ligand-to-ligand charge-transfer complexes of nickel(ii)† †Electronic supplementary information (ESI) available: Complete experimental procedures, 1H, 13C and VT NMR data, complete electrochemical and solvatochromic analysis, and frontier orbital energies and atomic positions from DFT calculations. CCDC 1414822–1414824. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c5sc02703a Click here for additional data file. Click here for additional data file.
متن کامل
The protecting-group free selective 3′-functionalization of nucleosides† †Electronic supplementary information (ESI) available. CCDC 1525736–1525737. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c6sc05081f Click here for additional data file. Click here for additional data file.
General ............................................................................................................................................S1 General Procedure A: Preparation of 3’-Phosphorylated Nucleosides .................................S1 Preparation of 3’-acetylated Nucleosides...................................................................................S8 NMR Studies .........
متن کاملRhodium-catalyzed C–H functionalization-based approach to eight-membered lactams† †Electronic supplementary information (ESI) available: Data for new compounds and experimental procedures and theoretical studies on mechanisms. CCDC 979559 and 990983. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c5sc00092k Click here for additional data file. Click here for additional data file.
Laboratory of Molecular Recognition an Zhejiang University, Hangzhou 310027, Zh ac.cn State Key Laboratory of Organometallic C Chemistry, Chinese Academy of Sciences, [email protected] Shanghai Key Laboratory of Magnetic Reson Normal University, Shanghai 200062, P. R. † Electronic supplementary information ( and experimental procedures and theor 979559 and 990983. For ESI and crystallo format s...
متن کامل