Reactions of Phenyl(styryl)iodonium Tetrafluoroborate with Halide Ions
作者:Tadashi Okuyama、Hajime Oka、Masahito Ochiai
DOI:10.1246/bcsj.71.1915
日期:1998.8
spectroscopy, and kinetic measurements are consistent with major pathways involving pre-equilibrium formation of halo-λ3-iodane and iodate intermediates, leading to the in-plane vinylic SN2 substitution to (Z)-2 and the intramolecular β-elimination to 3. The minor retained product (E)-2 is concluded to be formed through the vinylenebenzenium ion intermediate in 2,2,2-trifluoroethanol through the ligand coupling
Dual Visible Light Photoredox and Gold-Catalyzed Arylative Ring Expansion
作者:Xing-zhong Shu、Miao Zhang、Ying He、Heinz Frei、F. Dean Toste
DOI:10.1021/ja500716j
日期:2014.4.23
A combination of visible light photocatalysis and gold catalysis is applied to a ring expansion-oxidative arylation reaction. The reaction provides an entry into functionalized cyclic ketones from the coupling reaction of alkenyl and allenyl cycloalkanols with aryl diazonium salts. A mechanism involving generation of an electrophilic gold(III)-aryl intermediate is proposed on the basis of mechanistic studies, including time-resolved FT-IR spectroscopy.