کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1326901 | 977450 | 2010 | 11 صفحه PDF | دانلود رایگان |
p-Cymene complexes MCl2(η6-p-cymene)L [M = Ru, Os; L = P(OEt)3, PPh(OEt)2, (CH3)3CNC] were prepared by allowing [MCl(μ-Cl)(η6-p-cymene)]2 to react with phosphites or tert-butyl isocyanide. Treatment of MCl2(η6-p-cymene)L complexes with 1,3-ArNNN(H)Ar triazene and an excess of NEt3 gave the cationic triazenide derivatives [M(η2-1,3-ArNNNAr)(η6-p-cymene)L]BPh4 (Ar = Ph, p-tolyl). Neutral triazenide complexes MCl(η2-1,3-ArNNNAr)(η6-p-cymene) (M = Ru, Os) were also prepared by allowing [MCl(μ-Cl)(η6-p-cymene)]2 to react with 1,3-diaryltriazene in the presence of triethylamine. p-Cymene complexes MCl2(η6-p-cymene)L reacted with equimolar amounts of 1,3-ArNNN(H)Ar triazene to give both triazenide complexes [M(η2-1,3-ArNNNAr)(η6-p-cymene)L]BPh4 and amine derivatives [MCl(ArNH2)(η6-p-cymene)L]BPh4. A reaction path for the formation of the amine complex is also reported. The complexes were characterised by spectroscopy and X-ray crystallography of RuCl2(η6-p-cymene)[PPh(OEt)2] and [Ru(η2-1,3-p-tolyl-NNN-p-tolyl)(η6-p-cymene){CNC(CH3)3}]BPh4. Selected triazenide complexes were studied as catalysts in the hydrogenation of 2-cyclohexen-1-one and cinnamaldehyde.
The preparation of triazenide complexes of ruthenium and osmium stabilised by the half-sandwich fragment [M(η6-p-cymene)L]+ with phosphite or isocyanide is described. Reaction of diaryltriazene, 1,3-ArNNN(H)Ar, toward complexes MCl2(η6-p-cymene)L leading to amine derivatives [MCl(ArNH2)(η6-p-cymene)L]BPh4 is also reported. The spectroscopic and crystallographic characterisation of new compounds, as well as their activity as catalysts in hydrogenation reactions, are also discussed.Figure optionsDownload as PowerPoint slide
Journal: Journal of Organometallic Chemistry - Volume 695, Issue 18, 15 August 2010, Pages 2142–2152