Synthesis and characterisation of a series of 1,2-phenylenedioxoborylcyclopentadienyl-metal complexes [Ti(IV), Zr(IV), Hf(IV), La(III), Ce(III), Yb(III), Sn(II) and Fe(II)]

The complexes [Ti(L1, L2 or L3)Cl3], [M(L1, L2, or L4)2Cl2] (M = Zr or Hf), [M(L3)Cl3], [M′(L1)3(THF)] (M′ = La, Ce or Yb), [Sn(L2)Cl] and [Fe(L2)2] have been prepared from the appropriate homoleptic metal chloride (or FeBr2) by an Si(X)Me3 - elimination route (X = Cl, or Br for Fe), and characterised by microanalysis, NMR and mass spectra and for [La(L1)3(THF)] by an X-ray structure. [η5-C5H4-BO2C6H4-1,2]− = L1 ; L2 and L3 are the 4-But and 3,5-But2 analogues; [μ-η5-C5H3(BO2C6H4-1,2)2SiMe2]2− = L4.