| Autor: |
Buchowicz, Wodzimierz, Wojtczak, Wioleta, Pietrzykowski, Antoni, Lupa, Anna, Jerzykiewicz, Lucjan B., Makal, Anna, Woniak, Krzysztof |
| Zdroj: |
European Journal of Inorganic Chemistry; February 2010, Vol. 2010 Issue: 4 p648-656, 9p |
| Abstrakt: |
The Nheterocyclic carbene NHC complexes [RC5H4NiXNHC] 2–5 have been prepared by treating nickelocene [or 1,1′bisalkenylnickelocene] with a suitable carbene precursor. The alkenylcyclopentadienido complexes 4and 5undergo chemoselective crossmetathesis with methyl acrylate or methyl vinyl ketone in the presence of the seocndgeneration Grubbs catalyst to yield complexes 6–8, which bear an α,βunsaturated carbonyl substituent on the cyclopentadienido ligand. The Xray crystal structure of 2[monoclinic,P21n, Ni–Ccarbene1.8793 Å] and 7[triclinic, P$\bar {1}$, Ni–Ccarbene1.88746 Å] reveal undistorted trigonalplanar Ni coordination. VTNMR studies of complexes 2and 3, which possess an Nalkyl substituent, show hindered rotation of the carbene ligand. Complexes [RC5H4NiXNHC], in the presence of an excess of MAO, display high activity in the polymerization of styrene and moderate activity in the oligomerization of phenylacetylene. |
| Databáze: |
Supplemental Index |
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