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Abstract
Aminosilanols can be stabilized kinetically, e.g. (Me 3 C) 2 Si(OH)NH 2 , which crystallizes in ladder like chains via H-bridges. Its lithium salt was characterized as tetramer, forming a Li─O cubane, while the sodium and potassium salts are hexagonal prisms. The aminosilanol reacts with halosilanes to give amino-1,3-siloxanes. Lithium salts of amino-1,3-disiloxanes were isolated as amido-1,3-siloxanes or silylamino-silanolates. This includes a 1,3-silylgroup migration from the oxygen to nitrogen atom. Lithium salts of fluorofunctional amino-1,3-disiloxanes were characterized by X-ray. They crystallize as monomers or dimers and have unusual types of structures. LiF-elimination from such lithium salts leads to the formation of four- or eight-membered (SiNSiO)-ring systems. The chemical behavior of aminosilanols, the formation of structural isomers and of different ring systems are proved by experiments, crystal structures, and quantum chemical calculations.
We are grateful to the Fonds der Chemischen Industrie for the financial support of this work.