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- W2097391173 abstract "Dicarbonylbis(1-oxa-1,3-diene) complexes of molybdenum and tungsten can be prepared from ethyl and methyl methacrylate by employing either (η6-C6H6)Mo(CO)3 or (CH3CH2CN)3W(CO)3 in modified standard complexation reactions. The crystalline, air-sensitive compounds can be obtained in 61%–94% yield. Both NMR spectroscopic studies and the X-ray crystal structure of the tungsten methyl methacrylate complex [H2CC(CH3)C(O)OCH3]2W(CO)2 suggest that the bonding mode of the unsaturated ester ligands in these compounds differs from η4 to some extent, i.e. the coordination of the carbonyl fragment is an intermediate between η2−π and η1 at the carbonyl oxygen. The unsaturated ester ligands are labile with respect to exchange reactions, which allows other 1-oxa-1,3-dienes to replace them under very mild conditions. Most interestingly, in the case of the tungsten compounds, even complexes of temperature-sensitive α,β-unsaturated ketones can thus be easily obtained in excellent yield at room temperature." @default.
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- W2097391173 date "1998-05-01" @default.
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- W2097391173 title "Comments on the paper titled: ‘Error formation in ansa-zirconocene catalyzed isotactic propylene polymerization’" @default.
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- W2097391173 doi "https://doi.org/10.1016/s0022-328x(96)06941-0" @default.
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