C−C Formation and C−O Cleavage Reactions on Hemilabile Arene−Phosphine Ligands in Route to η5-Cyclohexadienyl Iridium Compounds
作者： M. Victoria Jiménez , I. Idalia Rangel-Salas , Fernando J. Lahoz , Luis A. Oro
DOI: 10.1021/OM800402N
关键词:
摘要: Complexes of the type [Ir{η5-3-(CH3COCH2)C6H5OCH2CH2Pt-Bu2-k-P}(alkene)] (alkene = C2H4, 4, C3H6, 5) were prepared by nucleophilic addition acetone enolate to “ansa” π-arene/phosphine-type compounds [Ir(alkene)(η6-C6H5OCH2CH2Pt-Bu2-k-P)][BF4] 1, 2) where arene−phosphine is acting as a formal eight-electron-donor chelate ligand. On other hand, related [Ir{η5-3-(C6H5C≡C)C6H5OCH2CH2Pt-Bu2-k-P}(C2H4)] complex (6) was obtained phenylacetylide compound but reaction not fully completed. Compounds 4 and 5 react with methanol C−O bond cleavage process, producing vinylphosphine complexes [Ir(η5-C6H5O)(alkene)(t-Bu2PCH═CH2)] 7, 8). 7 8 are also treatment 1 2, respectively, basic solution in methanol. The vinyl group adds render an ether phosphine, which coordinates form, final isolated [Ir(OC6H5)(C2H4)(t-Bu2PCH2CH2OMe-k2-O,P)...
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