Abstract
The preparation of Cp*TaF4 (Cp* = C5Me5), Cp*NbF4 and CpNbF4 is reported. On the basis of an X-ray structural analysis it is shown that Cp*TaF4 forms a dimer in the solid state. Flourine compounds containing Cp* groups are easily soluble in organic solvents. The fluorine atoms in Cp*TaF4 may be replaced by other substituents. In contrast to TaF5 or NbF5, WF6 can be used directly to generate tungsten containing heterocyles. The new ligand Me2S(NPPh2NSiMe3)2, prepared from Me2S(NPPh2)2 and Me3SiN3, reacts with WF6 to form the heterocycle Me2S(NPPh2N)2WF4. The X-ray single-crystal structure analysis exhibits a puckered eight-membered ring with alternating short and long bond lengths.Furthermore we have investigated the chemistry of 1,3,5-tris(trifluoromethyl)benzene and 1-dimethylamino-3,5-bis(trifluoromethyl)benzene as bulky ligands in compounds of main group and transition elements. It will be shown that new compounds containing elements in low co-ordination numbers can be isolated.
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