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Issue 9, 2013
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Quantitation of the ligand effect in oxo-transfer reactions of dioxo-Mo(VI) trispyrazolyl borate complexes

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Abstract

The oxygen atom transfer reactivity (OAT) of dioxo-Mo(VI) complexes of hydrotrispyrazolyl borate (hydrotris(3,5-dimethylpyrazolyl)borate, TpMe2; hydrotris(3-isopropylpyrazol-1-yl)borate, TpiPr) with tertiary phosphines (PMe3, PMe2Ph, PEt3, PEt2Ph, PBun3, PMePh2, or PEtPh2) has been investigated. In acetonitrile, these reactions proceed via the formation of a phosphoryl intermediate complex that undergoes a solvolysis reaction. We report the synthesis and characterization of several phosphoryl complexes. The rates of formation of phosphoryl complexes and their solvation were determined by spectrophotometry. The rates of the reactions and the properties of the phosphoryl species were investigated using the Quantitative Analysis of Ligand Effect (QALE) methodology. The results show that, at least in this system, the first step of the reaction is controlled primarily by the steric factor, and in the second step, both electronic and steric factors are important. We also analyzed the effect of ligands on the reaction rate i.e., TpMe2vs. TpiPr.

Graphical abstract: Quantitation of the ligand effect in oxo-transfer reactions of dioxo-Mo(vi) trispyrazolyl borate complexes

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Publication details

The article was received on 04 Oct 2012, accepted on 07 Nov 2012 and first published on 08 Nov 2012


Article type: Paper
DOI: 10.1039/C2DT32349D
Citation: Dalton Trans., 2013,42, 3071-3081
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    Quantitation of the ligand effect in oxo-transfer reactions of dioxo-Mo(VI) trispyrazolyl borate complexes

    P. Basu, B. W. Kail, A. K. Adams and V. N. Nemykin, Dalton Trans., 2013, 42, 3071
    DOI: 10.1039/C2DT32349D

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