Dynamic Configurational Isomerism of a Stable Pentaorganosilicate

Authors

  • Erik P. A. Couzijn,

    1. Department of Chemistry, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands, Fax: (+31) 20-44-47488
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  • Marius Schakel Dr.,

    1. Department of Chemistry, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands, Fax: (+31) 20-44-47488
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  • Frans J. J. de Kanter Dr.,

    1. Department of Chemistry, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands, Fax: (+31) 20-44-47488
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  • Andreas W. Ehlers Dr.,

    1. Department of Chemistry, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands, Fax: (+31) 20-44-47488
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  • Martin Lutz Dr.,

    1. Bijvoet Center for Biomolecular Research, Crystal and Structural Chemistry, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
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  • Anthony L. Spek Prof. Dr.,

    1. Bijvoet Center for Biomolecular Research, Crystal and Structural Chemistry, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
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  • Koop Lammertsma Prof. Dr.

    1. Department of Chemistry, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands, Fax: (+31) 20-44-47488
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  • This work was supported by the Netherlands Foundation for Chemical Sciences (CW) with financial aid from the Netherlands Organization for Scientific Research (NWO). We thank Prof. G. W. Klumpp for helpful discussions and J. W. H. Peeters of the University of Amsterdam for exact mass determinations.

Abstract

original image

Molecule with three faces: Two of the three possible configurations that a stable silicate with five carbon substituents can adopt have been observed by NMR spectroscopy and shown to be in dynamic equilibrium through a Berry pseudorotation. The thermodynamics and kinetics of their exchange are in good agreement with calculations. The major configuration (from the crystal structure of the nBu4N+ salt) is shown in the center of the picture.

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