ChemInform Abstract: ON DEHYDROCONDENSATION OF ORGANOSILAZANES WITH ORGANOSILANES

Abstract

Tetramethyl‐dialkyl‐silazane (I) bilden mit Dialkylsilanen (II) in Gegenwart von Trimethyl‐kaliumsilanolat die Trisilylamine (III).

[Si(HNCH2CH2)2(NCH2CH2)N]2: A Novel Product of Hydrogen Elimination from HSi(HNCH2CH2)3N

“…Despite the apparent opportunity for 15 to polymerize on loss of H 2 , the formation of the dehydrocyclodimer 16 occurs in excellent yield under a variety of conditions: Numerous examples of dehydrocyclodimerization reactions involving tetracoordinate aminosilanes have been reported and catalytic dehydrocyclodimerization is believed to begin with deprotonation of an NH bond to form an amide. , The amide intermediate in our case would be 17 , which we had characterized earlier as the stable derivative 18 . Here the N→Si transannular bond is retained, as was shown by 29 Si NMR spectroscopy.…”

Synthesis and polymerization of cyclotetrasilazanes

“…Therefore, in our work, we used KH rather than potassium metal. However, base-catalyzed dehydrogenative SiH/NH coupling to form Si-N single bonds is also a known process (Eqn [5]), [14][15][16] and both processes may be expected to take part in the polymerization of cyclo-[CH 3 Si(H)NH] n and cyclotetrasilazanes 1 and 2, giving a rather nonuniform structure. If all of these were to react in the sense of the reaction shown in Eqn [4], ring fusion via 1,3-cyclodisilazane rings would result in an array, as shown in Fig.…”

Sustainable preparation of aminosilane monomers, oligomers, and polymers through Si–N dehydrocoupling catalysis

“…In 1975, the same group dehydrocoupled organosilazanes with silanes to form monomers and 4- or 6-membered cyclic organosilazanes using 1 mol% of KOSiMe 3 . 78 Finally, in 1977, Andrianov prepared polyorganocyclodisilazanes via the dehydrocoupling of 1,3-bis-(aminodimethylsilyl)tetramethylcyclodisilazane with PhMeSiH 2 at 80–300 °C using KOSiMe 3 (Fig. 26).…”