NNB-Type Tridentate Boryl Ligands Enabling a Highly Active Iridium Catalyst for C–H Borylation
作者:Siyi Ding、Linghua Wang、Zongcheng Miao、Pengfei Li
DOI:10.3390/molecules24071434
日期:——
Boryl ligands play a very important role in catalysis because of their very high electron-donating property. In this paper, NNB-type boryl anions were designed as tridentate ligands to promote aryl C–H borylation. In combination with [IrCl(COD)]2, they generate a highlyactive catalyst for a broad range of (hetero)arene substrates, including highly electron-rich and/or sterically hindered ones. This
Copper-mediated Regioselective C–H Cyanation of Phenols with Assistance of Bipyridine-type Bidentate Auxiliary
作者:Rikuo Kajiwara、Koji Hirano、Masahiro Miura
DOI:10.1246/cl.210439
日期:2021.10.5
A Cu-mediated ortho-selective C–H cyanation of phenols with ethyl cyanoformate as the cyano source has been developed. The key to success is the introduction of 4,4′-di-tert-butyl-2,2′-bipyridine (dtbpy) bidentate auxiliary on the phenol oxygen, which is easily attachable, detachable, and recyclable. The newly developed protocol is tolerant of several carbonyl functional groups, which are incompatible with previous Lewis-acid-promoted cyanation of phenols.
Correction: Ding, S., et al. NNB-Type Tridentate Boryl Ligands Enabling a Highly Active Iridium Catalyst for C–H Borylation. Molecules 2019, 24, 1434
作者:Siyi Ding、Linghua Wang、Zongcheng Miao、Pengfei Li
DOI:10.3390/molecules24091750
日期:——
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A Series of Dinuclear Copper Complexes Bridged by Phosphanylbipyridine Ligands: Synthesis, Structural Characterization and Electrochemistry
作者:Alyssia M. Lilio、Kyle A. Grice、Clifford P. Kubiak
DOI:10.1002/ejic.201201208
日期:2013.8.6
H3)2}](PF6)2 (4) were synthesized. The X-ray structures of 1–4 show that the complexes are dinuclear with the bidentate bipyridine coordinating to one copper atom and the phosphane moiety coordinating the other copper center. Complexes 3 and 4 possess short Cu–Cu distances with bridging acetonitrile and isocyanide ligands. The cyclic voltammograms of 1–4 were examined under N2 and CO2. Under N2, 1–3
A copper-mediateddehydrogenative C–H/C–H biaryl coupling of phenols and 1,3-azoles has been developed. The key to its success is the introduction of a bipyridine-type bidentate auxiliary, 4,4′-di(tert-butyl)-2,2′-bipyridine, on the phenol oxygen, which is readily prepared and easily attachable, detachable, and recyclable. The reaction proceeds smoothly in the presence of copper salt alone to form