Unusual Formation and Reactivity of a Diplatinum mu-phenylethenylidene Complex: Synthesis and Structures of cis,cis-[(PPh3)(C6F5)2Pt(mu-eta1-eta3-CHPhCCO)Pt(PPh3)2] and cis,cis-[(PPh3)2Pt{mu-eta2(C,S):eta1(CC(SPh)(CH2Ph)}Pt(C6F5)2(CO)] Dinuclear Compounds
- Ara, I. 2
- Berenguer, J.R. 1
- Forniés, J. 2
- Lalinde, E. 1
- Tomás, M. 2
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1
Universidad de La Rioja
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2
Instituto de Nanociencia y Materiales de Aragón
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ISSN: 0276-7333
Año de publicación: 1996
Volumen: 15
Número: 3
Páginas: 1014-1022
Tipo: Artículo
beta Ver similares en nube de resultadosOtras publicaciones en: Organometallics
Resumen
The μ-phenylethenylidene-bridged diplatinum complex [(OC)(C6F5)2Pt(μ-C=CHPh)Pt-(PPh 3)2], 1, synthesized from the reaction between the mononuclear alkynyl-hydride trans-[Pt(C≡CPh)H(PPh3)2] and cis-[Pt(C6F5)2(CO)(THF)] (THF = tetrahydrofuran), displays a remarkable reactivity associated with the μ-vinylidene ligand under mild conditions. The reaction of 1 with PPh3 (molar ratio 1:1) produces an unprecedented reductive coupling of the CO ligand and the vinylidene bridging group to give the compound cis,cis-[(PPh3)(C6F5) 2-Pt(μ-η1:η3-CHPhCCO)Pt(PPh 3)2], 2, which contains an expanded, unsaturated benzylideneketene bridging ligand. On the other hand, treatment of 1 with PhSH generates the new diplatinum compound cis,cis-[(PPh3)2Pt{μ-η2(C,S):η 1(C)-C(SPh)(CH2Ph)}Pt(C6F5) 2(CO)], 3, formed by a formal addition of the PhSH to the carbon-carbon double bond of the vinylidene group in 1. The structures of 2 and 3 have been fully elucidated by X-ray diffraction studies.