Addition of primary phosphines to the unsaturated triosmium cluster [(μ-H)Os3(CO)8{Ph2PCH2P(Ph)C6H4}]: Synthesis of triosmium clusters bearing dppm, phosphide and phosphinidene ligands via P–H bond activation
作者： Shamsuddin M Azad , Kazi A Azam , Shariff E Kabir , Madhu S Saha , GM Golzar Hossain
DOI: 10.1016/J.JORGANCHEM.2005.06.005
关键词:
摘要: Abstract Treatment of the electronically unsaturated cluster [(μ-H)Os3(CO)8{Ph2PCH2P(Ph)C6H4}] (1) with primary phosphines PPhH2 and PCyH2 gives phosphido bridged compounds [(μ-H)Os3(CO)8(μ-PPhH)(μ-dppm)] (2) [(μ-H)Os3(CO)8(μ-PCyH)(μ-dppm)] (3), respectively, by P–H bond activation demetallation phenyl ring diphosphine ligand. Thermolysis 2 3 in refluxing octane at 128 °C results formation phosphinidene [(μ-H)2Os3(CO)7(μ3-PPh)(μ-dppm)] (4) [(μ-H)2Os3(CO)7(μ3-PCy)(μ-dppm)] (5), further cleavage groups. All have been characterized infrared, 1H NMR, 31P{1H} NMR mass spectroscopic data together single-crystal X-ray diffraction studies for 4. Compound 4 consists a triangular osmium atoms symmetrically capped ligand bridging dppm
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