Silicon-nitrogen compounds iminosilanes

The synthesis of iminosilanes has opened up a new field of silicon-nitrogen chemistry. These compounds have an interesting chemistry. As shown, many addition and cycloaddition reactions are possible. Many new and surprising results are likely in the future. 

As mentioned in this chapter, in recent years much progress has been made in the chemistry of silicon-chalcogen multiple bonds. For silicon-sulfur doubly-bonded compounds, we have now several isolated examples, both kinetically stabilized and thermodynamically stabilized. Furthermore, there have been reports of the synthesis and characterization of stable compounds with silicon-nitrogen double bonds (i.e. silanimines or iminosilanes) as well as their heavier group 15 element analogues such as phosphasilenes and arsasilenes. 

This section deals with the Uteature since 1987 on sUicon-nitrogen multiply bonded species as a sequel to Raabe and Michl s chapte in Vol 1 of The Chemistry of Organic Silicon Compound. A comprehensive treatment of sUicon-nitrogen compounds has since appeared in 1989 in the Gmelin Handbook of Inorganic Chemistry covaing the literature until the end of 1987 . A review on iminosilanes and related compounds was published by Hemme and Klingebiel in 1995 . 

Summary One of the remarkable features of lithiated aminofluorosilanes and dilithiated diaminofluorosilanes with bulky substituents is that they do not undergo the expected substitution on treatment with MesSiCl on the nitrogen atom but instead on the silicon atom to give lithium derivatives of aminochlorosilanes. These salts are far less stable than the analogous fluorine compounds. LiCl elimination leads to the formation of iminosilanes and monomeric and dimeric silaamidides. 

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