A Cheap and Efficient Oxidant (<i>n</i>‑Bu)₄NNO₃‑Enabled C(sp²)– and C(sp³)–H Olefination at Room Temperature

To further promote the widely practical application of C–H activation, developing green and mild reaction conditions has invariably been the objective of researchers, especially when it comes to remote C–H activation reactions. Herein, we report a new cheap and powerful (n-Bu)4NNO3 oxidant. This oxidant is efficient and universal for Pd(II)-catalyzed sp2 and sp3 C–H olefination and allows the reaction to be carried out at room temperature. Because of this, we attempted to make C–H functionalization more economical and environmentally benign

Porous Metal–Organic Frameworks with Chelating Multiamine Sites for Selective Adsorption and Chemical Conversion of Carbon Dioxide

A combination of carbon dioxide (CO₂) capture and chemical fixation in a one-step process is attractive for chemists and environmentalists. In this work, by incorporating chelating multiamine sites to enhance the binding affinity toward CO₂, two novel metal–organic frameworks (MOFs) [Zn₂(L)­(2,6-NDC)₂(­H₂O)]­·1.5DMF­·2H₂O (<b>1</b>) and [Cd₂(L)­(2,6-NDC)₂]·1.5DMF·2H₂O (<b>2</b>) (L = <i>N</i>¹-(4-(1<i>H</i>-1,2,4-triazole-1-yl)­benzyl)-<i>N</i>¹-(2-aminoethyl)­ethane-1,2-diamine, 2,6-H₂NDC = 2,6-naphthalenedicarboxylic acid, DMF = <i>N</i>,<i>N</i>-dimethylformamide) were achieved under solvothermal conditions. Both <b>1</b> and <b>2</b> possess high selectivity for adsorption of CO₂ over CH₄ at room temperature under atmospheric pressure. Moreover, <b>1</b> has one-dimensional tubular channels decorated with multiactive sites including NH₂ groups and coordination unsaturated Lewis acid metal sites, leading to efficient catalytic activity for chemical fixation of CO₂ by reaction with epoxides to give cyclic carbonates under mild conditions

Rhodium-Catalyzed Direct <i>Ortho</i> C–H Arylation Using Ketone as Directing Group with Boron Reagent

A general method for selective <i>ortho</i> C–H arylation of ketone, with boron reagent enabled by rhodium complexes with excellent yields, is developed. The transformation is characterized by the use of air-stable Rh catalyst, high monoarylation selectivity, and excellent yields of most of the substrates

Rh(III)-Catalyzed <i>meta</i>-C–H Olefination Directed by a Nitrile Template

A range of Rh­(III)-catalyzed <i>ortho</i>-C–H functionalizations have been developed; however, extension of this reactivity to remote C–H functionalizations through large-ring rhodacyclic intermediates has yet to be demonstrated. Herein we report the first example of the use of a U-shaped nitrile template to direct Rh­(III)-catalyzed remote <i>meta</i>-C–H activation via a postulated 12-membered macrocyclic intermediate. Because the ligands used for Rh­(III) catalysts are significantly different from those of Pd­(II) catalysts, this offers new opportunities for future development of ligand-promoted <i>meta</i>-C–H activation reactions