TRIMESITYLLEAD DERIVATIVES, MES(3)PBR, R=ME, CH(2)PH, CH2CH=CH2, CH2C-CH, ME(3)GE INCLUDING STRUCTURAL-ANALYSIS OF MONOMERIC MES(3)PBCL ANDATTEMPTED FORMATION OF MES(3)PBSNME(3)

Trimesityllead-R derivatives (R = methyl, benzyl, allyl, propargyl, an d trimethylgermyl) have been synthesized from the salt elimination rea ction between trimesityllleadlithium and RX. The germanium derivative is the first alkylgermanium derivative of lead. The spectroscopic prop erties of the compounds are reported, along with the single crystal st ructure of trimesityllead chloride which reveals that the Pb atom has a distorted tetrahedral coordination with an average Pb-C bond length of 2.234 Angstrom, and C-Pb-Cl bond angles much smaller than the C-Pb- C angles. This is the first structurally characterized monomeric organ olead halide. The Pb-Cl bond length of 2.61 Angstrom is considerably s horter than the Pb-Cl bond length found in other oligomeric or polymer ic organolead chlorides and significantly longer than recent theoretic al estimations. Attempts to synthesize the trimethyltin derivative res ulted in migration of a mesityl group to form mesityltrimethyltin as t he only isolated compound.