A cross-coupling reaction using nitronyl nitroxide (NN) as a coupling partner was developed: Refluxing a mixture of [AuI(NN-2-ido)(PPh3)] and aryl iodide (Ar–I) in THF in the presence of 10 mol % [Pd(PPh3)4] produced a cross-coupling product NN-Ar in a high yield. This method allowed the direct introduction of the NN radical onto various poly- and heterocyclic aromatic rings.
Substituent effects on the reaction of 2-(substituted phenyl)-4,5-dihydro-4,4,5,5-tetramethylimidazol-1-oxyl 3-oxides with nitric oxide: an experimental and MNDO study
作者:Osamu Shimomura、Kazuhisa Abe、Minoru Hirota
DOI:10.1039/p29880000795
日期:——
constants of the oxygen transfer reaction of 2-(substitutedphenyl)-4,5-dihydro-4,4,5,5-tetramethylimidazol-1-oxyl3-oxides with nitricoxide have been measured by using liquid chromatography (h.p.l.c.). The Hammett ρ value (–0.37) indicates that electron-donating substituents favour the reaction. This can be explained by a mechanism which includes electron transfer to nitricoxide and can be rationalised by