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.
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