Heteroleptische Diorganylzink-Verbindungen des Typs (Me3Si)3C-Zn-R

Article abstract of DOI:10.1016/0022-328X(94)88066-2

The equimolar reaction of lithium tris(trimethylsilyl)methanide with zinc(II) chloride in a solvent mixture of THF and diethylether yields Lithium-trichloro-bis<zincate>*2THF*Et2O.The addition of organyl lithium leads to the formation of heteroleptic organyl-zinc.No ligand exchange reactions can be observed for these compounds.Due to the steric demand of the tris(trimethylsilyl)methyl substituent these derivatives are monomeric in solution as well as in the solid state.Bis(trimethylsilyl)methyl-zinc crystallizes in the monoclinic space group P2₁/n (a=910.7(2), b=1633.0(4), c=1863.9(4) pm, β=94.18(2)^o and Z=4).The Zn-C-distances are elongated to a value of 197 pm due to the steric demand of both the substituents.The zinc atom is with an CZnC angle of 176^o nearly linear coordinated.Phenyl-zinc with a melting point of about 24 deg C crystallizes upon cooling in a nitrogen stream (P2₁, a=908.4(3), b=1489.0(4), c=1594.5(3) pm, β=94.68(2)^o and Z=4).Due to the small size of the phenyl group rather short Zn-C-bond lengths of about 193.5 pm are formed.Key words: Silicon; Zinc; Trimethylsilyl