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Kinetics of the SN1 Dissociation of Ligands L (Nitriles, Phosphines) in the Complexes [CpFe(P-P)L]PF6 with Variable Chelate Ring Size. A Surprising Bimolecular Substitution in the Nonchelate Complex [CpFe(PPh2Me)2L]PF6

Brunner, Henri ; Kitamura, Hikaru ; Tsuno, Takashi



Abstract

The complexes [CpFe{Ph2P(CH2)(n)PPh2}NCMe]-PF6, [CpFe(PPh2Me)(2)NCMe]PF6, and [CpFe{Ph2P(CH2)(n)PPh2}-PPh2(OR)PF6, R = Me, Et, and iPr, with chelate ring sizes between 4 and 7 were synthesized and characterized by spectroscopy and Xray analysis. In these complexes, the monodentate ligands acetonitrile and PPh2(OR) tend to dissociate. The kinetics of the ligand exchanges MeCN/P(OMe)(3) and ...

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