Activation of sp3 Carbon−Hydrogen Bonds by Cobalt and Iron Complexes and Subsequent C−C Bond Formation
Citations Over TimeTop 13% of 2009 papers
Abstract
The sp3 C−H bond activation induced by CoMe(PMe3)4 and FeMe2(PMe3)4 was investigated. C(sp3)-cyclometalated complexes, based on diphosphinito PCP ligand (Ph2POCH2)2CH2, Co{(Ph2POCH2)2CH}(PMe3)2 (1), and Fe{(Ph2POCH2)2MeC}(H)(PMe3)2 (2), were obtained under mild conditions. Iodomethane is oxidatively added to 1, affording Co{(Ph2POCH2)2CH}(PMe3)(Me)(I) (3). Monocarbonylation of the hydrido-iron complex 2 occurs with substitution of a trimethylphosphine ligand trans to the hydrido ligand, affording Fe{(Ph2POCH2)2MeC}(H)(CO)(PMe3) (4). The reaction of 2 with phenylacetylene delivered the demetalated new diphosphine ligand (Ph2POCH2)2CHCH3 (6) and bis(phenylethinyl)iron complex Fe(PhCC)2(PMe3)4 (5). The new complexes 1−4 were characterized by spectroscopic methods and by X-ray diffraction analysis.
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