dirhodium complex Rh2(esp)2, α-diazo dibenzothiophenium salts generate highly electrophilic Rh-coordinated carbenes, which evolve differently depending on their substitution pattern. Keto-moieties directly attached to the azomethinic carbon promote carbene insertion into one of the adjacent C–S bonds, giving rise to highly electrophilic dibenzothiopyrilium salts. This intramolecular pathway is not operative
N‐(sulfonio)sulfilimine reagents: Non‐oxidizing Sources of Electrophilic Nitrogen Atom for Skeletal Editing
作者:Tobias Heilmann、Juan M Lopez-Soria、Johannes Ulbrich、Johannes Kircher、Zhen Li、Brigitte Worbs、Christopher Golz、Ricardo A Mata、Manuel Alcarazo
DOI:10.1002/anie.202403826
日期:——
Under rhodium catalysis N-sulfonio(sulfilimines) act as sulfonitrene precursors. Reaction of such species with indenes presumably delivers N-sulfonio aziridines, which evolve to isoquinolines via electrocyclic ring expansion. Contrarily, 1-arycyclobutenes are transformed into 1-cyano-1-arylcyclopropanes via ringcontraction.
Fessler, Mark E.; Spencer, James T.; Lomax, Joseph F., Inorganic Chemistry, 1988, vol. 27, # 18, p. 3069 - 3075
作者:Fessler, Mark E.、Spencer, James T.、Lomax, Joseph F.、Grimes, Russell N.
DOI:——
日期:——
The combination of mononuclear metallocene and phenoxyimine complexes to give trinuclear catalysts for the polymerization of ethylene
作者:Christian Görl、Helmut G. Alt
DOI:10.1016/j.jorganchem.2007.10.001
日期:2007.12
Trinuclear complexes were synthesized by combination of metallocene and phenoxyimine zirconium complexes. After activation with methylalumoxane (MAO), these catalysts polymerize ethylene with moderate and good activities. Due to the presence of different catalytic centers, polyethylenes with broad or bimodal molecular weight distributions were obtained.
Di- and trinuclear zirconium complexes as catalysts for ethylene polymerization
作者:Andrea M. Rimkus、Helmut G. Alt
DOI:10.1016/j.jorganchem.2016.07.018
日期:2016.10
achieved with di- or trinuclear zirconium catalysts in homogeneous solution. In order to prepare such complexes, bis(phenoxyimine) zirconium complexes and zirconocene complexes were coupled in Sonogashira reactions. Hydrosilylation reactions were applied for the combination of metallocene complexes with silane substituted N-heterocyclic compounds, such as 3,5-dimethylpyrazoles. The resulting di- and trinuclear