Publikation: Heptahexaenylidene Complexes : Synthesis and Characterization of the First Complexes with an M=C=C=C=C=C=C=CR 2 Moiety (M = Cr, W)
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Silica-induced elimination of dimethylamide from [(CO)5M(CC)3C(NMe2)3]- [M = Cr (4a), W (4b)] affords the first isolated and characterized heptahexaenylidene complexes [(CO)5 M=C=C=C=C=C=C=C(NMe2)2] (5a,b). Complexes 4a,b were generated by sequential reaction of Me3Si(CC)3SiMe3 with LiMe•LiBr, [(Me2N)3C]+Cl-, LiBu, and [(CO)5M(thf)]. Complex 5b is inert in methanol, but adds dimethylamine across the C5=C6 bond to give [(CO)5W=C=C=C=C=C{CH=C(NMe2)2}NMe2]. The reaction of 5a,b with LiMe•LiBr and SiO2 generates the heptahexaenylidene complexes [(CO)5M=C=C=C=C=C=C=C(Me)NMe2] (8a,b). Trapping of 8b with HNMe2yields pentatetraenylidene complex [(CO)5W=C=C=C=C=C{CH=C(Me)NMe2}NMe2].
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DEDE, Markus, Matthias DREXLER, Helmut FISCHER, 2007. Heptahexaenylidene Complexes : Synthesis and Characterization of the First Complexes with an M=C=C=C=C=C=C=CR 2 Moiety (M = Cr, W). In: Organometallics. 2007, 26(17), pp. 4294-4299. ISSN 0276-7333. eISSN 1520-6041. Available under: doi: 10.1021/om700386tBibTex
@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:abstract xml:lang="eng">Silica-induced elimination of dimethylamide from [(CO)<sub>5</sub>M(CC)<sub>3</sub>C(NMe<sub>2</sub>)<sub>3</sub>]<sup>-</sup> [M = Cr (4a), W (4b)] affords the first isolated and characterized heptahexaenylidene complexes [(CO)<sub>5</sub> M=C=C=C=C=C=C=C(NMe<sub>2</sub>)<sub>2</sub>] (5a,b). Complexes 4a,b were generated by sequential reaction of Me<sub>3</sub>Si(CC)<sub>3</sub>SiMe<sub>3</sub> with LiMe•LiBr, [(Me<sub>2</sub>N)<sub>3</sub>C]<sup>+</sup>Cl<sup>-</sup>, LiBu, and [(CO)<sub>5</sub>M(thf)]. Complex 5b is inert in methanol, but adds dimethylamine across the C5=C6 bond to give [(CO)<sub>5</sub>W=C=C=C=C=C{CH=C(NMe<sub>2</sub>)<sub>2</sub>}NMe<sub>2</sub>]. The reaction of 5a,b with LiMe•LiBr and SiO<sub>2</sub> generates the heptahexaenylidene complexes [(CO)<sub>5</sub>M=C=C=C=C=C=C=C(Me)NMe<sub>2</sub>] (8a,b). Trapping of 8b with HNMe<sub>2</sub>yields pentatetraenylidene complex [(CO)<sub>5</sub>W=C=C=C=C=C{CH=C(Me)NMe<sub>2</sub>}NMe<sub>2</sub>].</dcterms:abstract>
<dcterms:issued>2007</dcterms:issued>
<dc:creator>Fischer, Helmut</dc:creator>
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