Mild Cobalt(III)‐Catalyzed C–H Hydroarylation of Conjugated C=C/C=O Bonds

Abstract

An efficientc obalt(III)-catalyzed C-2-selective indole C-Hh ydroarylation of acrolein, enones,a nd glyoxylates was achieved under mild reaction conditions.T he versatilec obalt(III) catalyst displayed excellent positional selectivity with the assistance of pyrimidinyl, pyridyl, andp yrazolyl directing groups,t hus overcoming the inherent C-3 selectivity of an electrophilic indole derivatization. This approachp rovides an expedient route to indolyl-substituteda ldehydes,k etones,a nd estersw ith wide functional group tolerance.I naddition, it also features high step-and atom-economy.

Pentamethylcyclopentadienyl rhodium(III)–chiral disulfonate hybrid catalysis for enantioselective C–H bond functionalization

“…46,47 Realizing a similar process via C-H bond activation can circumvent the use of stoichiometric amounts of organometallic reagents. A series of racemic reactions were reported using Cp*Rh(III) [48][49][50] and Cp*Co(III) [51][52][53] catalysts, but catalytic stereocontrol was achieved only in the reaction with nitroalkenes using a chiral Cp x Rh(III) catalyst. 50…”

A Novel Metal-Free Polymer-Based POPD/g-C3 N4 Photocatalyst with Enhanced Charge Carrier Separation for the Degradation of Tetracycline Hydrochloride

“…In the process of photocatalytic degradation, part of the electrons are captured by the oxygen dissolved in the water and produce the superoxide radicals * O 2 À to degrade TC-HCl. [27] Meanwhile, the other parts of the electrons react with H 2 O 2 in the water to produce hydroxyl radicals * OH to remove TC-HCl. In addition, the holes could degrade TC-HCl directly.…”

Highly Efficient and Color‐Stable Thermally Activated Delayed Fluorescence White Light‐Emitting Diodes Featured with Single‐Doped Single Emissive Layers

“…In addition to the ≈100% RISC efficiency (Table S1, Supporting Information), the tert-butyl and diphenylphosphine oxide (DPPO) groups in ptBCzPO 2 TPTZ provide the large steric hindrance to restrain the intermolecular interactions effectively (Figure 1b), evidenced by the highest EQE of its blue diodes achieved at the doping concentration of 80%. [17] Similarly, there are eight tert-butyl groups surrounding the emitting core of 4CzTPNBu. Therefore, it is convincing that the host-dopant interactions in 4CzTPNBu-doped ptBCzPO 2 TPTZ matrix can be well controlled to suppress the collisional quenching and hinder the host-dopant charge exchange.…”