Tail-to-tail carbon–carbon bond coupling of acetylides on chalcogen-bridged Fe/W mixed-metal clusters
Abstract
On thermolysis of a toluene solution containing [Fe3(CO)9(µ3-E)2] (E = S 1a, Se 16 or Te 1c) and [W(η5-C5Me5)2(CO)3(C![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
CPh)] 2 the new clusters [W2Fe3(η5-C5Me5)2(CO)6(µ3-E)2{µ4-CC(Ph)C(Ph)C}] (E = S 3, Se 4 or Te 5) were isolated. Compounds 3–5 were characterised by IR and 1H, 13C, 77Se and 125Te NMR spectroscopy. The crystal structure of 3 was elucidated by X-ray diffraction methods. It shows a novel tail-to-tail coupling of substituted acetylides on a sulfur-bridged mixed-metal Fe–W cluster.
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