Structure investigations on lithiumhalosilylamides have repeatedly yielded astonishing results. Depending on the solvents and the substitution of the nitrogen, they are isolated as acyclic, three- to penta-, bi-, and spiro-cyclic compounds. The shortest Si–N bond (157.9pm) of four-coordinated silicon is found in these salts. The different formation of silicon–nitrogen containing rings by elimination of alkaline halides from halosilylamides depends on the solvent and structural make-up of the halosilylamides. Four- to 14-membered rings are formed.Four-membered SiN-rings with the smallest angles at the silicon (76°), and the cyclodisilazane dications are obtained. Stable iminosilenes and iminosilanes are isolated and unusual cycloaddition products are presented.