Magnesium-catalysed hydroboration of pyridines : kinetic analysis and poly-pyridine dearomatisation

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Weetman, Catherine and Hill, Michael S. and Mahon, Mary F. (2016) Magnesium-catalysed hydroboration of pyridines : kinetic analysis and poly-pyridine dearomatisation. Polyhedron, 103 (Part A). pp. 115-120. ISSN 0277-5387 (https://doi.org/10.1016/j.poly.2015.08.018)

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Abstract

A kinetic analysis of the hydroboration of iso-quinoline with pinacol borane (HBpin) and catalysed by a β-diketiminato magnesium n-butyl pre-catalyst has provided evidence that the reaction proceeds via rate determining Mg–N/H–B metathesis of a dearomatised iso-quinolide anion. The reaction rate is suppressed by increasing [iso-quinoline] leading to the suggestion that catalytic turnover is also dependent on a pre-equilibrium involving dissociation of donor substrate molecules from the coordination sphere of the catalytic Mg centre. Stoichiometric reactions with a variety of poly-pyridine heterocycles have provided a range of magnesium derivatives of the dearomatised poly-pyridides either by alkyl or hydride transfer. The resistance of these latter species toward hydroboration is rationalised as a consequence of their additional coordinative stability providing corroborative evidence for the dissociative mechanism inferred from the kinetic analysis.

ORCID iDs

Weetman, Catherine ORCID logoORCID: https://orcid.org/0000-0001-5643-9256, Hill, Michael S. and Mahon, Mary F.;
  • Item type:Article
    ID code:73656
    Dates:
    Date
    Event
    1 January 2016
    Published
    22 August 2015
    Accepted
    Subjects:Science > Chemistry
    Department:Faculty of Science > Pure and Applied Chemistry
    Depositing user: Pure Administrator
    Date deposited:20 Aug 2020 08:52
    Last modified:04 Dec 2024 12:48
    URI:https://strathprints.strath.ac.uk/id/eprint/73656
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