First ruthenium complexes with a chelating arene carbene ligand as catalytic precursors for alkene metathesis and cycloisomerisation
Makaleler > Tam Makale · 2001
Yazarlar: Bekir Çetinkaya, Serpil Demir, Ismail Özdemir, Loïc Toupet, David Se´meril, Christian Bruneau, Pierre H. Dixneuf
New Journal of Chemistry, Uluslararası, Wos, 2001, cilt 25, ss 519-521
DOI: 10.1039/b100264n
Özet
Electron-rich carbene precursors 2 and 3, containing the imidazolidin-2-ylidene moiety with one (2) and two (3) pendent N-(2,4,6-trimethylbenzyl) groups, on reaction with [RuCl2(arene)]2 lead to ruthenium(II) complexes 5 and 6 containing the chelating 8-electron mixed arene–carbene ligand; the X-ray diffraction crystal structure of RuCl2{η1-CN[CH2( η6-2,4,6-Me3C6H2)]CH2CH2N(CH2CH2OMe)} 6, was established. These complexes are precursors of the unstable ruthenium-allenylidene intermediates 7 and 8, but are active catalysts either for selective catalytic alkene metathesis or cycloisomerization, depending on the nature of the 1,6-diene.