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Binuclear Complexes with an Aminocarbene-Cyclopropenylidene Unit as Bridging Ligand :  Facile Migration of Carbonylmetal Fragments in Carbene Complexes

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2002

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Fuß, Bettina
Dede, Markus

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Organometallics. 2002, 21(21), pp. 4425-4431. ISSN 0276-7333. eISSN 1520-6041. Available under: doi: 10.1021/om020481q

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The sequential reaction of the (dimethylamino)ethynylcarbene complexes [(CO)5MC(NMe2)CCH] (1a−c:  M = W (a), Mo (b), Cr (c)) with BuLi, [M(CO)6], and CF3SO3CH3 affords homobinuclear complexes with an aminocarbene−cyclopropenylidene bridging ligand, (3a−c). Two isomeric heterobinuclear complexes (4xy and 4yx) are formed in the reaction of [(CO)5MC(NMe2)CCH] (1) with BuLi, [M‘(CO)6] (M ≠ M‘:  W, Mo, Cr), and CF3SO3CH3. 4xy and 4yx differ in the relative distribution of the metals M and M‘:  (4xy) and (4yx). The 4xy/4yx ratios obtained by the two different possible reaction sequences are similar. Complexes 4xy and 4yx do not interconvert. The reaction of cis-[(CO)4(Me3P)WC(NMe2)CCH] with BuLi, [W(CO)6], and CF3SO3CH3 likewise gives two isomers, (7) and (8). These results demonstrate the facile migration of carbonylmetal fragments along a carbon chain. The structures of the complexes 3b,c and 7 have been established by X-ray structural analyses.

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ISO 690FUSS, Bettina, Markus DEDE, Bernhard WEIBERT, Helmut FISCHER, 2002. Binuclear Complexes with an Aminocarbene-Cyclopropenylidene Unit as Bridging Ligand :  Facile Migration of Carbonylmetal Fragments in Carbene Complexes. In: Organometallics. 2002, 21(21), pp. 4425-4431. ISSN 0276-7333. eISSN 1520-6041. Available under: doi: 10.1021/om020481q
BibTex
@article{Fu2002Binuc-22927,
  year={2002},
  doi={10.1021/om020481q},
  title={Binuclear Complexes with an Aminocarbene-Cyclopropenylidene Unit as Bridging Ligand :  Facile Migration of Carbonylmetal Fragments in Carbene Complexes},
  number={21},
  volume={21},
  issn={0276-7333},
  journal={Organometallics},
  pages={4425--4431},
  author={Fuß, Bettina and Dede, Markus and Weibert, Bernhard and Fischer, Helmut}
}
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