Abstract
The complex [Pt(C 2H 4)(PPh 3) 2] reacts with Pb 2Ph 6 to give cis-[PtPh(Pb 2Ph 5)(PPh 3) 2]; this decomposes in solution to cis-[PtPh(PbPh 3)(PPh 3) 2], which may also be obtained from the ethylene complex and PbPh 4. Lead compounds PbPhMe 3 and PbPh 3Br also give products of insertion into PbPh bonds, but PbMe 3Cl gives cis- and trans-[PtCl(PbMe 3)(PPh 3) 2]. The complex trans-[Pt(PbPh 3) 2(PEt 3) 2] reacts with 1,2-bis(diphenylphosphino)ethane (DPPE) to give [Pt(PbPh 3) 2(DPPE)] which readily decomposes in dichloromethane in presence of PEt 3 to give [Pt(PbPh 3)(PEt 3)(DPPE)]Cl and [PtPh(PEt 3)(DPPE)]Cl. The complex trans-[PtCl(PbPh 3)(PEt 3) 2] was detected in the products of reactions between trans-[PtCl 2(PEt 3) 2] and trans-[Pt(PbPh 3) 2(PEt 3) 2] or less than 2 moles of LiPbPh 3; it was not detected in the mixture after treatment of trans -[Pt(PbPh 3) 2(PEt 3) 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(PPh 3) 2] and Ph 3PbNO 3. The complexes and their decomposition products were identified by pre31P-{ 1H} NMR spectroscopy.
Published Version
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