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A novel route to trans-Pt(PEt3)2(PbPh3)Cl

1969; Elsevier BV; Volume: 17; Issue: 1 Linguagem: Inglês

10.1016/s0022-328x(00)88056-0

1872-8561

G. Deganello, Giovanni Carturan, Paolo Uguagliati,

Metal complexes synthesis and properties

The complex [Pt(C2H4)(PPh3)2] reacts with Pb2Ph6 to give cis-[PtPh(Pb2Ph5)(PPh3)2]; this decomposes in solution to cis-[PtPh(PbPh3)(PPh3)2], which may also be obtained from the ethylene complex and PbPh4. Lead compounds PbPhMe3 and PbPh3Br also give products of insertion into PbPh bonds, but PbMe3Cl gives cis- and trans-[PtCl(PbMe3)(PPh3)2]. The complex trans-[Pt(PbPh3)2(PEt3)2] reacts with 1,2-bis(diphenylphosphino)ethane (DPPE) to give [Pt(PbPh3)2(DPPE)] which readily decomposes in dichloromethane in presence of PEt3 to give [Pt(PbPh3)(PEt3)(DPPE)]Cl and [PtPh(PEt3)(DPPE)]Cl. The complex trans-[PtCl(PbPh3)(PEt3)2] was detected in the products of reactions between trans-[PtCl2(PEt3)2] and trans-[Pt(PbPh3)2(PEt3)2] or less than 2 moles of LiPbPh3; it was not detected in the mixture after treatment of trans -[Pt(PbPh3)2(PEt3)2] with HCl. In contrast to an earlier report, we were unable to detect lead-containing complexes in the products of the reaction between trans-[PtHCl(PPh3)2] and Ph3PbNO3. The complexes and their decomposition products were identified by pre31P-{1H} NMR spectroscopy.