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A new tris(diphenylstannylene)triosmium Carbonyl Cluster Complex and Its Reactions with Pt(PBu3t)2 and Pt(PPh 3)4
The reaction of Os3(CO)12 with Ph3SnH yielded the bimetallic Os-Sn cluster complexes Os3(CO) 11-(SnPh3)(mu-H) (16) and Os3(CO) 9(mu-SnPh2)3 (17) in 20 and 21% yields, respectively. Compound 16 consists of an Os3 triangle with a terminal SnPh3 group on one of the Os atoms and a bridging hydrido ligand across one of the Os-Os bonds. Compound 17 consists of a central Os 3 triangle with SnPh2 groups bridging each of the three Os-Os bonds. Pt(PBu3t)2 reacts with compound 17 to afford Os3(CO)9[Pt-(PBu3 t)](mu-SnPh2)3 (18), a Pt(PBu 3t) adduct of 17, in 29% yield by adding a Pt(PBu 3t) group across one of the Os-Sn bonds. The osmium and tin atoms lie in a plane, while the Pt(PBu3t) group is displaced slightly out of that plane. Pt(PPh3)4 reacts with 17 to give the cluster complex Os3(CO) 9[Pt(Ph)(PPh3)2](mu-SnPh2) 2(mu3-SnPh) (19) in 21% yield by insertion of a Pt(PPh3)2 into one of the Sn-C bonds to one of the phenyl groups. The osmium and tin atoms are coplanar, and there is a Pt(Ph)(PPh 3)2 group terminally bonded to one of the tin atoms. The platinum atom of the Pt(Ph)(PPh3)2 group has a square-planar geometry with the two PPh3 ligands in cis coordination sites. All new products were characterized crystallographically by single-crystal X-ray diffraction techniques.
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Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method