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The
activity of several yttrium alkoxide and aryloxide complexes
supported by a ferrocene-based ligand incorporating two thiol phenolates,
thiolfan (1,1′-bis(2,4-di-<i>tert</i>-butyl-6-thiomethylenephenoxy)ferrocene),
was studied. The <i>tert</i>-butoxide complex could only
be isolated in the ate form, while a monophenoxide complex could be
obtained for OAr = 2,6-di-<i>tert</i>-butylphenolate. The
synthetic utility of these yttrium complexes has been demonstrated
by the ring-opening polymerization of cyclic esters, with a high activity
toward ε-caprolactone and δ-valerolactone being found
for the yttrium phenoxide complex
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