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• W1979024243 endingPage "4881" @default.
• W1979024243 startingPage "4874" @default.
• W1979024243 abstract "Monomeric and dimeric nickelalactones with N-heterocyclic carbene ligands [(py)(immes)Ni(CH2CH2COO)] (1), [(immes)Ni(CH2CH2COO)]2 (2), [(imt-but)Ni(C(Et)C(Et)-COO)]2 (3), [(immes)Ni(C(Et)C(Et)-COO)]2 (4), and [(immes)Ni(CH2C(CH3)C(CH3)-CH2-COO)] (5) (immes: 1,3-dimesityimidazol-2-ylidene; imt-but: 1,3-di-t-butylimidazol-2-ylidene) were synthesized and investigated by 1H, 13C NMR and IR spectroscopic measurements. The solid-state structures of 1–3 and 5 were also elucidated by X-ray diffraction analyses of single crystals. In the compounds the Ni(II) ion has square-planar geometry. The metal centers in the dimers 2 and 3 are bridged by two endocyclic oxygen donor atoms of the carboxylate groups resulting in Ni2O2-four-membered rings. Reaction of [(im2mes)Ni with 2,3-dimethylbutadiene and CO2 resulted in an oxidative coupling of the two dienes followed by insertion of CO2 to form the dimeric complex 6. The X-ray structure of 6 shows two substituted heptenoic acid dianions which connect the two Ni(II) centers. Each nickel atom is surrounded by a η3-allyl group, a monodentate carboxylate group and an immes ligand." @default.
• W1979024243 created "2016-06-24" @default.
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• W1979024243 date "2006-11-01" @default.
• W1979024243 modified "2023-10-18" @default.
• W1979024243 title "Saturated and unsaturated nickelalactones with N-heterocyclic carbene ligands: Synthesis and structures" @default.
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• W1979024243 doi "https://doi.org/10.1016/j.jorganchem.2006.08.016" @default.
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