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Issue 6, 2012
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Structural influence of steric factors and donor functions on lithium silylamides in non-coordinating solvents

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Abstract

We herein present the synthesis and crystallographic characterisation of lithium silylamides displaying different coordination numbers and aggregation states according to the number of N- and O-donor functions in the starting material, (aminomethyl) substituted silazane ligands. The dimeric dimethyl-(N-lithio-tert-butylamino)-piperidinomethyl)-silane and dimethyl-(N-lithio-iso-propylamino)-piperidinomethyl)-silane, with three-coordinate lithium centres, were prepared by deprotonation of the corresponding silazane with nBuLi. Using the tridentate silazane (1R,2R)-N1-[{(tert-butylamino)-dimethylsilyl}methyl]-N1,N2,N2-trimethylcyclohexane-1,2-diamine a mixed “dimer” of lithium silylamide and lithium silanolate with four-coordinate lithium centres was obtained. Additionally, a monomeric lithium silylamide was synthesised using the tridentate [bis(methoxyethyl)aminomethyl] side arm.

Graphical abstract: Structural influence of steric factors and donor functions on lithium silylamides in non-coordinating solvents

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Article information


Submitted
17 Aug 2011
Accepted
07 Nov 2011
First published
15 Dec 2011

Dalton Trans., 2012,41, 1897-1902
Article type
Paper

Structural influence of steric factors and donor functions on lithium silylamides in non-coordinating solvents

V. P. Colquhoun and C. Strohmann, Dalton Trans., 2012, 41, 1897
DOI: 10.1039/C1DT11550B

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