From Silanetriols to Aluminosilicates

One of the most important use of the silanetriols is their ability to act as synthons to generate soluble analogs of naturally occurring aluminosilicates (1). A number of reactions of silanetriols with aluminum precursors, such as AlMes, Alf-Bu2H, LiAlH4, and NaAlEt2H2 have been studied. 

The naturally occurring aluminosilicates contain anionic aluminum centers. In order to generate soluble derivatives containing such anionic A1 centers, the reactions of LiAIH4 or NaAlEt2H2 with silanetriol 3 have proved to be useful. 

Schlenk line N2), two 100 mL Schlenk flasks, magnetic stirrer, glove box, septum, J-Young flask for dry solvents, syringe, safety glasses, laboratory coat, and protective gloves. 

All manipulations were carried out in an inert gas atmosphere of dinitrogen using standard Schlenk techniques and in a dinitrogen-filled glove box. The solvents used were purified either over sodium/potassium and benzophenone or by an MBRAUN solvent purification system MB SPS-800. 

General procedure for 5-7 A suspension of silanetriols (1—4) in n-hexane ( 30mL) and 1,4-dioxane or THF (5mL) was treated with the aluminum hydrides (5.00 mmol) in n-hexane at room temperature. After about 2 min three equivalents of gas had been formed. The solution was concentrated to half its volume in vacuum. A white microcrystalline solid was obtained at -21°C. 

---