کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1328647 | 977609 | 2005 | 6 صفحه PDF | دانلود رایگان |
Treatment of the electronically unsaturated cluster [(μ-H)Os3(CO)8{Ph2PCH2P(Ph)C6H4}] (1) with primary phosphines PPhH2 and PCyH2 gives the phosphido bridged compounds [(μ-H)Os3(CO)8(μ-PPhH)(μ-dppm)] (2) and [(μ-H)Os3(CO)8(μ-PCyH)(μ-dppm)] (3), respectively, by P–H bond activation of the phosphines and demetallation of the phenyl ring of the diphosphine ligand. Thermolysis of 2 and 3 in refluxing octane at 128 °C results in the formation of the phosphinidene compounds [(μ-H)2Os3(CO)7(μ3-PPh)(μ-dppm)] (4) and [(μ-H)2Os3(CO)7(μ3-PCy)(μ-dppm)] (5), respectively, by further P–H bond cleavage of the phosphido groups. All the compounds have been characterized by infrared, 1H NMR, 31P{1H} NMR and mass spectroscopic data together with single-crystal X-ray diffraction studies for 4. Compound 4 consists of a triangular cluster of osmium atoms with a symmetrically capped phosphinidene ligand and a bridging dppm ligand.
Treatment of the electronically unsaturated cluster [(μ-H)Os3(CO)8{Ph2PCH2P(Ph)C6H4}] (1) with primary phosphines PPhH2 and PCyH2 gives the phosphido bridged compounds [(μ-H)Os3(CO)8(μ-PPhH)(μ-dppm)] (2) and [(μ-H)Os3(CO)8(μ-PCyH)(μ-dppm)] (3), respectively, by P–H bond activation of the phosphines and demetallation of the phenyl ring of the diphosphine ligand. Thermolysis of 2 and 3 in refluxing octane at 128 °C results in the formation of the phosphinidene compounds [(μ-H)2Os3(CO)7(μ3-PPh)(μ-dppm)] (4) and [(μ-H)2Os3(CO)7(μ3-PCy)(μ-dppm)] (5), respectively, by further P–H bond cleavage of the phosphido groups. The molecular structure of 4 has been determined by single crystal X-ray diffraction analysis.Figure optionsDownload as PowerPoint slide
Journal: Journal of Organometallic Chemistry - Volume 690, Issue 18, 15 September 2005, Pages 4206–4211