@article{Dede2007Hepta-22833,
  year={2007},
  doi={10.1021/om700386t},
  title={Heptahexaenylidene Complexes : Synthesis and Characterization of the First Complexes with an M=C=C=C=C=C=C=CR 2 Moiety (M = Cr, W)},
  number={17},
  volume={26},
  issn={0276-7333},
  journal={Organometallics},
  pages={4294--4299},
  author={Dede, Markus and Drexler, Matthias and Fischer, Helmut}
}

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    <dcterms:title>Heptahexaenylidene Complexes : Synthesis and Characterization of the First Complexes with an M=C=C=C=C=C=C=CR 2 Moiety (M = Cr, W)</dcterms:title>
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    <dc:creator>Drexler, Matthias</dc:creator>
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    <dc:contributor>Dede, Markus</dc:contributor>
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    <dc:creator>Dede, Markus</dc:creator>
    <dc:contributor>Drexler, Matthias</dc:contributor>
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    <dcterms:abstract xml:lang="eng">Silica-induced elimination of dimethylamide from [(CO)&lt;sub&gt;5&lt;/sub&gt;M(CC)&lt;sub&gt;3&lt;/sub&gt;C(NMe&lt;sub&gt;2&lt;/sub&gt;)&lt;sub&gt;3&lt;/sub&gt;]&lt;sup&gt;-&lt;/sup&gt; [M = Cr (4a), W (4b)] affords the first isolated and characterized heptahexaenylidene complexes [(CO)&lt;sub&gt;5&lt;/sub&gt; M=C=C=C=C=C=C=C(NMe&lt;sub&gt;2&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;] (5a,b). Complexes 4a,b were generated by sequential reaction of Me&lt;sub&gt;3&lt;/sub&gt;Si(CC)&lt;sub&gt;3&lt;/sub&gt;SiMe&lt;sub&gt;3&lt;/sub&gt; with LiMe•LiBr, [(Me&lt;sub&gt;2&lt;/sub&gt;N)&lt;sub&gt;3&lt;/sub&gt;C]&lt;sup&gt;+&lt;/sup&gt;Cl&lt;sup&gt;-&lt;/sup&gt;, LiBu, and [(CO)&lt;sub&gt;5&lt;/sub&gt;M(thf)]. Complex 5b is inert in methanol, but adds dimethylamine across the C5=C6 bond to give [(CO)&lt;sub&gt;5&lt;/sub&gt;W=C=C=C=C=C{CH=C(NMe&lt;sub&gt;2&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;}NMe&lt;sub&gt;2&lt;/sub&gt;]. The reaction of 5a,b with LiMe•LiBr and SiO&lt;sub&gt;2&lt;/sub&gt; generates the heptahexaenylidene complexes [(CO)&lt;sub&gt;5&lt;/sub&gt;M=C=C=C=C=C=C=C(Me)NMe&lt;sub&gt;2&lt;/sub&gt;] (8a,b). Trapping of 8b with HNMe&lt;sub&gt;2&lt;/sub&gt;yields pentatetraenylidene complex [(CO)&lt;sub&gt;5&lt;/sub&gt;W=C=C=C=C=C{CH=C(Me)NMe&lt;sub&gt;2&lt;/sub&gt;}NMe&lt;sub&gt;2&lt;/sub&gt;].</dcterms:abstract>
    <dcterms:issued>2007</dcterms:issued>
    <dc:creator>Fischer, Helmut</dc:creator>
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