Iridium Catalyzed Selective Arylation of B(3)‐H Bond of o‐Carborane via B−H/C−H Activation

Abstract

An iridium catalyzed selective B−H/C−H dehydrogenative coupling for arylation of electron deficient B(3)‐H of o‐carborane with benzamides has been developed. A plausible mechanism involving IrIII/IrV catalyzed BH/CH activation was proposed. This work has important value for selective functionalization of B(3,6)‐H bonds via dehydrogenative coupling.

Quinoxaline-based nonfullerene acceptors with powerful core-functionalization ability enabling efficient solar energy utilization

“…1, Qx offers two sites for the introduction of various groups or side chains, which have a notable effect on material solubility, miscibility with the polymer donor, molecular packing, crystallinity behavior, electron mobility, and active-layer morphology. 35,[43][44][45][46][47][48][49] Two phenyl groups with more functionalization sites can be linked to the Qx moiety (Fig. 2).…”

Migration Mechanism of the B−H Activation of Carboranes

“…The distinctive three-dimensional structure and unique electronic properties of carborane cause the different activities of hydrogen atoms in the carborane cage. [1][2][3][4][5][6][7][8] BÀ H functionalisation on carborane has developed rapidly in recent years; [9][10][11][12][13][14] however, the selective BÀ H activation reaction still faces many challenges. The challenges are principally reflected in two aspects: the polarity and nucleophilicity of BÀ H bonds are greatly lower than those of the corresponding CÀ H bonds because of the electron-deficient characteristic of boron.…”

Transverse momentum resummation for s -channel single top quark production at the LHC

“…There are three production modes, s-channel, t-channel and tW associated production. In addition to measuring the V tb Cabibbo-Kobayashi-Maskawa (CKM) matrix element [1,2], they are also sensitive to different kinds of new physics (NP) models beyond the standard model (SM) , such as new heavy gauge boson W [16][17][18], fermions [21][22][23], scalars [19,20], and W tb anomalous couplings [1,[24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. Compared with the t-channel and tW associated production, the s-channel single top quark event is more sensitive to NP effects induced by heavy resonance states.…”