The Presence and Absence of Agostic Electrostatic Si-H⊙⊙⊙ M Interactions in [M {Me2Si (H) Nt-Bu}](M= Li, Mg1/2) Species

B Goldfuss, PR Schleyer, S Handschuh…

Index: Goldfuss, Bernd; Schleyer, Paul Von Rague; Hampel, Frank Journal of the American Chemical Society, 1997 , vol. 119, # 5 p. 1072 - 1080

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Citation Number: 21

Abstract

The 1H-6Li HOESY spectrum of [Li {Me2Si (H) Nt-Bu}] in toluene detects two major species with strong Si-H⊙⊙⊙ Li interactions, but no short Si-H⊙⊙⊙ Li contacts are present in its solvent-free X-ray structure. However, replacement of Li+ by Mg2+ results in agostic Si- H⊙⊙⊙ Mg contacts (2.2, 2.5 Å) in the X-ray crystal structure of [Mg2 {Me2Si (H) Nt-Bu} 4](shown).

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