The preparation and properties of N,N′-bis(chlorodimethylsilyl)tetramethylcyclodisilazane and its derivatives

Add time:07/17/2019    Source:sciencedirect.com

N,N′-Bis(chlorodimethylsilyl)tetramethylcyclodisilazane, which is obtained along with minor proportions of 1,3-dichloro-1,1,3,3-tetramethyldisilazane, 1,5-dichloro-1,1,3,3,5,5-hexamethyltrisilazane, and N-(chlorodimethylsilyl)-N′-(3-chloro-1,1,3,3-tetramethyldisilazanyl)tetramethylcyclodisilazane by heating dichlorodimethylsilane and 2,2,4,4,6,6-hexamethylcyclotrisilazane at 175°, can be converted to its amino, methylamino, dimethylamino, diethylamino, piperidino, anilino, hydride, methyl, phenyl, methoxy, ethoxy, isopropoxy, phenoxy, phenyldimethylsiloxy, hydroxy, and acetoxy derivatives. Substances in this series are readily characterized by the Si2N asymmetric stretch frequencies in the IR and the methylsilyl proton chemical shifts in the NMR spectra. They do not undergo thermal disproportionation reactions, but the hydroxy, amino, and methylamino derivatives undergo thermal decomposition with the cleavage of the cyclodisilazane ring, particularly in the presence of an acid catalyst.

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