Syntheses of RuHCl(CO)(PAr<sub>3</sub>)<sub>3</sub> and RuH<sub>2</sub>(CO)(PAr<sub>3</sub>)<sub>3</sub> Containing Various Triarylphosphines and Their Use for Arylation of Sterically Congested Aromatic C–H Bonds
A series of ruthenium complexes, RuHCl(CO)(PAr3)(3) and RuH2(CO)(PAr3)(3), containing various triarylphosphines were synthesized. Screening of these complexes as catalysts for direct arylation of sterically congested ortho C-H bonds of aromatic ketones improved the yields of the arylation products.
US7645771B2
申请人:——
公开号:US7645771B2
公开(公告)日:2010-01-12
Substituent Effects. 22. The Solvolysis of α-<i>t</i>-Butylbenzyl Tosylates
作者:Yutaka Tsuji、Mizue Fujio、Yuho Tsuno
DOI:10.1246/bcsj.63.856
日期:1990.3
r values suggest the operation of the kc mechanism in this solvolysis without nucleophilic solvent assistance and methyl participation. From a comparison of the substituent effects, the exalted r value of 1.15 observed in the solvolysis of α-methylbenzyl chlorides can be attributed to the enhanced resonance demand characteristic of secondary benzylic system rather than to a correlational artifact arising
a state-of-the-art methodology enabling radical–radical coupling. The catalytic process involves forming an acyl azolium intermediate from the NHC catalyst and an acyl donor, followed by single electron reduction of this key intermediate, which is largely dependent on the photoredox catalyst. We designed a radical NHC catalysis in which the direct photoexcitation of a borate to form a high reducing