η-Vinylidene formation from internal alkynones by C-C bond migration
European Journal of Inorganic Chemistry, ISSN: 1099-0682, Vol: 2007, Issue: 25, Page: 3943-3946
2007
- 47Citations
- 6Captures
- 1Mentions
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Article Description
The [μ-N(CpRu(PPh)) ] (1) dication is a source of the formal 16-electron [CpRu(PPh)] fragment, and it reacts with internal alkynes such as 1,3-diphenylpropynone, 4-phenyl-3-butyn-2- one, and 3-cyclopropyl-1-phenylpropynone to yield η-vinylidene complexes 2a-2c by C-C bond activation. In the case of 1,3-diphenylpropynone, the η-ketone complex [CpRu(PPh ){PhC(η-O)C≡CPh}] (3a) was isolated as its PF salt, and it is apparently an intermediate in the formation of the vinylidene complex. Complexes 2a-2c were characterized as their BAr [ArF = 3,5-bis(trifluoromethyl)phenyl] salts by NMR and IR spectroscopic methods, ESI-MS, and EA. The single crystal X-ray diffraction structure of 2aBAr is presented. These reactions represent the first examples where an internal alkyne undergoes C-C bond migration to form an η-vinylidene complex. © Wiley-VCH Verlag GmbH & Co. KGaA, 2007.
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