A complex interplay between the catalyst concentration and the reaction rate exists, as shown by kinetic studies, for the [Cp2TiMe2]-catalyzed intermolecular hydroamination of alkynes. The reason for this is a reversible dimerization of the catalytically active species [Eq. (1)]. L1, L2=Cp (cyclopentadienyl), Tol–NH (Tol=4-MeC6H4, tolyl).
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Pohlki et al. (2001) studied this question.