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The lithium derivate of the octamethylcyclotetrasilazane 1 reacts with fluorosilanes with substitution (2) or substitution and contraction to give cyclotrisilazanes (3—6). Lithiated 6 again reacts with substitution (7, 11, 12) or substitution and isomerization to give 1,3-(Si–N–Si) substituted cyclodisilazanes (8, 13). Starting with the dilithiated eight membered ring (14) the reactions with fluorosilanes lead to the formation of the unsymmetrically 1-(Si)-3-(Si – N – Si – N –Si)-substituted four membered rings (9, 10). The isomerization of the lithium salts depends on thermal, thermodynamic and kinetic effects.

zeitschrift für naturforschung b

Kontraktionsreaktionen lithiierter Cyclotetrasilazane zu Cyclotri- und Cyclodisilazanen / Contraction Reactions of Lithiated Cyclotetrasilazanes Yielding Cyclotri- and Cyclodisilazanes