Catalytic Intermolecular Ortho-Arylation of Phenols
作者:Robin B. Bedford、Michael E. Limmert
DOI:10.1021/jo030157k
日期:2003.10.1
catalysts such as [RhCl(PPh3)3] or [[RhCl(COD)]2] with PiPr2(OAr) or P(NMe2)3 co-catalysts allows the ortho-selective intermolecular arylation of phenols. The reaction proceeds via orthometalation of P-OAr groups and then transesterification liberates the product phenol. When 2-substituted phenols are used as substrates, [RhCl(PPh3)3]/iPr2(OAr) mixtures are typically the catalysts of choice, whereas for substrates
The Effect of Aromatic Ethers on the Trimerisation of Ethylene using a Chromium Catalyst and Aryloxy Ligands
作者:David H. Morgan、Sianne L. Schwikkard、John T. Dixon、Jerald J. Nair、Roger Hunter
DOI:10.1002/adsc.200303070
日期:2003.8
A catalyst system consisting of a chromium source, a 2,6-disubstituted phenol and an aromaticether solvent, on activation with triethylaluminium, is active and selective for the trimerisation of ethylene to form 1-hexene. The aromaticether appears to play a role as both solvent and reagent and is pivotal in ensuring both the good activity of the system as well as selectivity to the desired product
Dye Molecules for Simple Co-Sensitization Process: Fabrication of Mixed-Dye-Sensitized Solar Cells
作者:Mutsumi Kimura、Hirotaka Nomoto、Naruhiko Masaki、Shogo Mori
DOI:10.1002/anie.201108610
日期:2012.4.27
Sensitive kind of dye: Co‐sensitization of the TiO2 electrode using PcS15 and the dye D131 results in a dramatic enhancement of the photocurrent response for the entire visible‐light region. This method provides a simple design for accessing dye‐sensitized solarcells.
established that the acidity of phenol can be fine-tuned with substituents on its aromatic ring via through-bond effects, the role of through-space effects on the acidity of phenols is presently poorly understood. Here, we present integrated experimental and computational studies on substituted 2,6-diarylphenols that demonstrate the essential contribution from through-space OH−π interactions and O––π interactions
Split cross-coupling via Rh-catalysed activation of unstrained aryl–aryl bonds
作者:Congjun Yu、Zining Zhang、Guangbin Dong
DOI:10.1038/s41929-024-01120-9
日期:——
aryl–aryl bonds has been a fundamental challenge in organic synthesis due to the inertness of these bonds. Here we report a split cross-coupling strategy that allows twofold arylation with diverse aryl iodidesthrough cleaving unstrained aryl–aryl bonds of common 2,2′-biphenols. The reaction is catalysed by a rhodium complex and promoted by a removable phosphinite directing group and an organic reductant