Breed, L. W., R. L. Elliott, and J. C. Wiley Jr. Journal of Organometallic Chemistry 24.2 (1970): 315-325.
N, N'-bis (chlorodimethylsilyl) tetramethylcyclodisilazane can be converted to its amino, methylamino, dimethylamino, diethylamino, piperidinyl, hydride, methyl, phenyl, methoxy, ethoxy, isopropoxy, phenoxy, phenyldimethylsiloxy, hydroxyl and acetoxy derivatives by heating dichlorodimethylsilane with 2,2,4,4,6,6-hexamethylcyclotrisilazane at 175°C. The materials in this series are easily characterized by Si,N asymmetric stretching frequencies in the IR and chemical shifts of the methylsilyl protons in the NMR spectrum. They do not undergo thermal disproportionation, but the hydroxyl, amino and methylamino derivatives undergo thermal decomposition and cyclodisilazane ring cleavage, especially in the presence of acid catalysts.
A mixture of 158 g (0.72 mole) of 2,2,4,4,6,6-hexamethylcyclotrisilazane and 139 g (1.08 mole) of dichlorodimethylsilane was heated at 175°C for 77 hours, cooled manually, and the residue crystallized. To this residue was added 200 ml of petroleum ether and the soluble portion was decanted from the insoluble ammonium chloride. Fractionation gave a series of fractions, 160 g (60%), with sizes ranging from 151-166" (45 mm), with an overall purity of 96% for N,N'-bis(chlorodimethylsilyl)tetramethylcyclodisilazane as determined by GLC.
Rodríguez-Baeza, Mario, Andrónico Neira C, and Carlos Aguilera J. Polymer Bulletin 50 (2003): 25-32.
