Lithiumsalze des Tris(trimethylsilylamino)silans - Zur Struktur in Lösung und im Festkörper

✍ Scribed by Kosse, Peer ;Popowski, Eckhard ;Veith, Michael ;Huch, Volker

• Publisher: Wiley (John Wiley & Sons)
• Year: 1994
• Tongue: English
• Weight: 824 KB
• Volume: 127
• Category: Article
• ISSN: 0009-2940
• DOI: 10.1002/cber.1491271103

✦ Synopsis

Silane, tris(trimethylsily1amino)-/ Silylamides, lithium / Equilibria / Structure determination in solution and in the solid state / Polycycles Lithium Salts of Tris(trimethylsily1amino)silane -Their Structures in Solution and in the Solid State*

Amides, which result from the reaction of tris(trimethylsily1amino)silane (Me3SiNH)3SiH (1) with n-butyllithium in the molar ratio 1 : l and 1:2 in nonpolar solvents, form a system in which the aminosilane 1, the monoamide (Me3SiNLi)(Me3. SiNH&SiH (Za), the diamide (Me3SiNLi),(Me3SiNH)SM (3), and the triamide (Me3SiNLi)3SiH (4) are in equilibrium. When the monoamide 2a is dissolved in THF only the dimeric monolithiated THF adduct 2b is obtained. An X-ray structure analysis of the lithium silylamide 2b reveals that in the dimeric unit one of the lithium atoms is coordinated by THF, the two lithium atoms thus differing in coordination number (3 versus 4). An X-ray study of the triamide 4 reveals a cen-