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Heptahexaenylidene Complexes : Synthesis and Characterization of the First Complexes with an M=C=C=C=C=C=C=CR 2 Moiety (M = Cr, W)

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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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. 26(17), pp. 4294-4299. ISSN 0276-7333. eISSN 1520-6041

@article{Dede2007Hepta-22833, 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)}, year={2007}, doi={10.1021/om700386t}, number={17}, volume={26}, issn={0276-7333}, journal={Organometallics}, pages={4294--4299}, author={Dede, Markus and Drexler, Matthias and Fischer, Helmut} }

Fischer, Helmut eng Heptahexaenylidene Complexes : Synthesis and Characterization of the First Complexes with an M=C=C=C=C=C=C=CR 2 Moiety (M = Cr, W) Drexler, Matthias 2013-05-31T15:38:08Z Organometallics ; 2007, 26 (17), pp 4294–4299 deposit-license Drexler, Matthias Dede, Markus 2013-05-31T15:38:08Z 2007 Dede, Markus Silica-induced elimination of dimethylamide from [(CO)<sub>5</sub>M(CC)<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(CC)<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>]. Fischer, Helmut

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