@article{Fischer2007Conju-22830,
  year={2007},
  doi={10.1135/cccc20070503},
  title={Conjugated Polyunsaturated Oxacyclic Carbene Complexes : Synthesis, Structure, and Properties},
  number={4},
  volume={72},
  issn={0010-0765},
  journal={Collection of Czechoslovak Chemical Communications},
  pages={503--526},
  author={Fischer, Helmut and Rädler, Michael and Mosbacher, Alexander and Drexler, Matthias and Hübner, Eike and Weibert, Bernhard and Heck, Jürgen and Wittenberg, Christian and Steffens, Stefan}
}

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    <dc:contributor>Fischer, Helmut</dc:contributor>
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    <dc:contributor>Wittenberg, Christian</dc:contributor>
    <dc:contributor>Weibert, Bernhard</dc:contributor>
    <dc:creator>Drexler, Matthias</dc:creator>
    <dc:contributor>Hübner, Eike</dc:contributor>
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    <dcterms:bibliographicCitation>Collection of Czechoslovak chemical communications ; 72 (2007), 4. - S. 503-526</dcterms:bibliographicCitation>
    <dc:creator>Rädler, Michael</dc:creator>
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    <dc:contributor>Steffens, Stefan</dc:contributor>
    <dc:creator>Wittenberg, Christian</dc:creator>
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    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2013-05-24T07:33:58Z</dc:date>
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    <dcterms:title>Conjugated Polyunsaturated Oxacyclic Carbene Complexes : Synthesis, Structure, and Properties</dcterms:title>
    <dcterms:abstract xml:lang="eng">The reaction of [(CO)5M(thf)] with but-3-yn-1-ols in the presence of NEt3 offers a convenient route to 2-oxacyclopentylidene complexes [(CO)5M=C-O-CH2CH2CH2] (M = Cr (1a), W (1b)) in yields up to 96%. Furthermore, the reaction of 1 with ω-(dimethylamino)- substituted enals, Me2N-(CH=CH)n-C(=O)H, activated by Me3SiCl/NEt3 or POCl3/NEt3 gives via aldol condensation the unsaturated oxacyclic push-pull carbene complexes [(CO)5M=C-O-CH2CH2C{=CH-(CH=CH)n-NMe2}] (n = 0 (2), 1 (3), 2 (4), 3 (5)). In 2-5, the amino group acts as an electron-donor unit and the oxacyclic carbene pentacarbonyl moiety as an electron acceptor. The aminometallaenes 2-5 have been characterized spectroscopically, the chromium complexes 2a-5a additionally by X-ray structure analysis. For some complexes, their nonlinear optical properties (second harmonic generation) have been studied and β values up to 58 × 10-30 esu have been determined. The results of DFT calculations on chromium complexes 2a-5a show that on lengthening of the unsaturated chain the influence of the carbonyl-metal fragment on the polyunsaturated chain strongly decreases.</dcterms:abstract>
    <dc:creator>Steffens, Stefan</dc:creator>
    <dc:creator>Hübner, Eike</dc:creator>
    <dc:contributor>Mosbacher, Alexander</dc:contributor>
    <dc:contributor>Heck, Jürgen</dc:contributor>
    <dc:creator>Heck, Jürgen</dc:creator>
    <dc:contributor>Rädler, Michael</dc:contributor>
    <dc:creator>Mosbacher, Alexander</dc:creator>
    <dc:contributor>Drexler, Matthias</dc:contributor>
    <dc:creator>Weibert, Bernhard</dc:creator>
    <dc:creator>Fischer, Helmut</dc:creator>
    <dcterms:issued>2007</dcterms:issued>
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