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Dicationic Alkylidene−, Olefin−, and Alkoxyalkenylcarbene−Osmium Complexes Stabilized by a NHC Ligand

AuthorsBuil, María L. ; Castarlenas, Ricardo ; Esteruelas, Miguel A. ; Izquierdo, Susana ; Lalrempuia, Ralte ; Oñate, Enrique
Issue Date2010
PublisherAmerican Chemical Society
CitationOrganometallics 29(4): 876–882 (2010)
AbstractComplex [Os(═CHPh)(CH3CN)4(IPr)](OTf)2 (1) (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazolylidene; OTf = CF3SO3) exchanges the alkylidene group with propylene to give styrene and [Os(═CHCH3)(CH3CN)4(IPr)](OTf)2 (2). The reaction of 1 with ethylene leads to [Os(η2-CH2═CH2)(CH3CN)4(IPr)](OTf)2 (3) via the propylene intermediate [Os(η2-CH2═CHCH3)(CH3CN)4(IPr)](OTf)2 (4). Acetonitrile displaces the olefin ligand of both 3 and 4 to generate the pentakis (solvento) derivative [Os(CH3CN)5(IPr)](OTf)2 (5). In 2-propanol and methanol, complex 5 reacts with 1,1-diphenyl-2-propyn-1-ol and 2-methyl-3-butyn-2-ol to yield the corresponding alkoxyalkenylcarbene compounds [Os{═C(OR)CH═CR′2}(CH3CN)4(IPr)](OTf)2 (R = CH(CH3)2; R′ = Ph (6), CH3 (7); R = CH3; R′ = Ph (8), CH3 (9)). The X-ray structures of 4, 5, and 6 are also reported.
Description7 páginas, 3 figuras, 5 esquemas.
Publisher version (URL)http://dx.doi.org/10.1021/om900949j
Appears in Collections:(ICMA) Artículos
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