Methyl plumbyl

Methyl trimethylsilyl tellurium and phenyl trimethylsilyl tellurium exchanged the organyltelluro group for halogen in reactions with silyl, germyl, stannyl and plumbyl halides2. 

ArPb(OzC-CF3)2 Ar+ + Pb(02C CF3)2]. The aryl cations have been trapped with aromatic compounds to give biaryls [with certain substrates, notably poly-methylbenzenes, high yields (up to 88 %) are obtained], but with reactive aromatic substrates aryl cations are not the precursors to the biaryls and in these cases it is proposed that reaction proceeds via preliminary complex formation between the substrate and a species which contains an aryl-lead bond. Oxidative coupling of methyl-substituted benzenes by the reagent Pb(0Ac)4-CFs C02H to give biaryls and diarylmethane is also considered to involve formation of a radical cation in the primary step. A study has also been made of the plumbylation of monohalogeno-benzenes with Pb(OAc)4-CF3 COsH. ... 

The use of heavy metal reagents in the olefination of carbonyl compounds is in its infancy. However. Kauffmann and co-workers have shown that the phenyl-thio(triphenyl-stannyl or -plumbyl)methyl-lithiums (170) react with benz-aldehyde to give mixtures of threo- (171) and erythro- adducts (173). After the isomers are separated, each is capable of being converted into the ( )- or (Z)-p-phenylthiostyrene, (172) or (174), respectively, stereospecifically, as shown in Scheme 23. 

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