Reaction of the hindered, substituted electron-withdrawing cyclopentadienyl zirconium complex [Zr{C5H2(SiMe3)3}2(Me)2] with CO leads, via the acyl intermediate [Zr{C5H2(SiMe3)3}2(COMe)(Me)] detected during the course of the reaction, to the metal hydride enolate [Zr{C5H2(SiMe3)3}2(H){OC(Me)CH2}].
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Choukroun et al. (1995) studied this question.
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