Scheer, Manfred and Kramkowski, Peter and Krug, Joachim and Kramkowski, Peter and Corrigan, John F. (1997) Reaction of Phosphaalkynes with [Ru4(CO)13(μ3-PPh)]: Synthesis of Unsymmetrically Capped Bisphosphinidene Complexes. Organometallics 16 (26), pp. 5917-5922.
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The 62-electron cluster [Ru4(CO)13(μ3-PPh)] (1) reacts with phosphalkynes RCP [(R = tBu, Ar‘ (2,4,6-tBu3C6H2)] to yield a series of unsymmetrically capped bisphosphinidene clusters characterized by a ketene substituted μ4-PR ligand. The reaction pathway was followed by 31P-NMR spectroscopy and reveals that, in the first step of the reaction, a CO substitution of 1 occurs in order to form an intermediate with a σ- or π-bonded phosphaalkyne. After scavenging of CO the chain compound [Ru4(CO)12(μ3-PPh)(μ3-PC(CO)R)] [R = tBu (2), Ar‘ (7)] is created. Further CO elimination leads to the closo-complexes [Ru4(CO)10(μ-CO)(μ4-PPh)(μ4-PC(CO)R)] [R = tBu (3), Ar‘ (4)]. Due to steric reasons the nido-cluster [Ru3(CO)9(μ3-PPh)] (5) is the final product in the reaction starting from Ar‘CP. The molecular structures of the complexes 2−5 are discussed.
|Institutions:||Chemistry and Pharmacy > Institut für Anorganische Chemie > Chair Prof. Dr. Manfred Scheer|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||21 Jun 2010 12:45|
|Last Modified:||20 Jul 2011 22:30|