Alkene Dissociation from a d0 Yttrocene−Alkyl−Alkene Complex Generates a Pyramidal Alkyl Yttrium Complex That Inverts Slowly

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Abstract

The d0 yttrium(III)−alkyl−alkene chelate Cp*2Y[η1:η2-CH2CH2CH(CH3)CHCH2] (5) was prepared by reaction of 3-methyl-1,4-pentadiene with (Cp*2YH)2. Variable-temperature 13C NMR spectroscopy of 5 showed that the environments of the two diastereotopic Cp* ligands were averaged by a fluxional process which requires both reversible alkene dissociation and inversion at the yttrium center; the energy barrier for alkene dissociation plus yttrium inversion is 9.6 ± 0.3 kcal mol-1.

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