Cyclic silylhydroxylamines and 1,3-diaza-2-silacyclopentane - Lithium derivatives and reactions

Lithium derivatives of silylhydroxylamines are used for more than thirty ye ars. Now we are able to present the first crystal structures. Lithium is bo nded side on and end on in these silylhydroxylamides. Depending on the reac tion conditions and the bulkiness of the substituents dimeric, trimeric, an d tetrameric oligomers are found. Fluoro-functional bis(silyl)hydroxylamine s are excellent precursors for rings. By-products of the syntheses of bis(s ilyl)hydroxylamines are N, bis(silyl)ethylendiamines, which are easily cycl ized forming 1,2-diaza-2-silacyclopentanes. Reactions and X-ray analyses ar e discussed.