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Conformation and Stereodynamics of Aliphatic Triisopropylsilanes in Solution and in the Solid State

✍ Scribed by J. Edgar Anderson; Daniele Casarini; Lodovico Lunazzi; Andrea Mazzanti

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 268 KB
Volume: 2000
Category: Article
ISSN: 1434-193X
DOI: 10.1002/(sici)1099-0690(200002)2000:3<479::aid-ejoc479>3.0.co;2-#

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✦ Synopsis

A dynamic process has been detected in the solution 13 C-NMR spectra of tBuϪSi(iPr)3 (4) in the temperature range Ϫ145 °C to Ϫ163 °C, the corresponding free energy of activation being 5.5 kcal mol Ϫ1 . Molecular mechanics calculations have identified three types of conformations that are markedly more stable than all the others, but the one with the highest symmetry cannot be populated, as is evident from the appearance of the spectrum at low temperature.

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