Reaktionen am Cyclotrisilazan-System - Synthese und Molekülstruktur eines 1.3.5.7-Tetraaza-2.4.6.8-tetrasila-bicyclo [4.2.0] octans / Reactions of the Cyclotrisilazane System - Synthesis and Molecular Structure of a 1,3,5,7-Tetraaza-2,4,6,8-tetrasilabicyclo[4,2,0]octane

Abstract

1,3-Dilithio-5-trimethylsilyl-2,2,4,4,6,6-hexamethylcyclotrisilazane (1) reacts in a 1:2 molar ratio with difluorodimethyl- or trifluoromethylsilane to give substitution at the lithiated N atoms. The reaction of the bis(fluorodimethylsilyl)-substituted compound with more of 1 produces ring contraction, to form a silyl-bridged tris(cyclodisilazane). In the reaction of the bis(difluoromethylsilyl)-substituted cyclotrisilazane with more of 1, however, the title compound, a fused ring system, is formed. This compound has been characterised by crystal structure determination. The mechanism of its formation is discussed.