Interconversions in Cyclosilazanes and their Application to Sin - Ceramics

Abstract Rearrangements occur very frequently in reactions of cyclosilazanes. We have found an equilibrium between the eight-, six-, and four-membered ring anions, which is strongly dependent on thermal and kinetic effects, the choice of substituents and the properties of the attacking group. Knowledge of the interconversion mechanisms has enabled us to prepare silyl-bridged and coupled cyclosilazanes of high molecular weight. These coumpounds are useful precursors of SiN-ceramics.