Lithium-fluorsilanolate - Bausteine ketten- und ringförmiger Siloxane

✍ Scribed by Klingebiel, Uwe

• Publisher: Wiley (John Wiley & Sons)
• Year: 1981
• Tongue: English
• Weight: 275 KB
• Volume: 114
• Category: Article
• ISSN: 0009-2940
• DOI: 10.1002/cber.19811141016

✦ Synopsis

Lithium Fluorosilanolates -Units of Chain and Ring Siloxanes Potassium hydroxide reacts with difluorosilanes R -SiF, -R' (1 -4: R = R' = CMe,, NC,H,-(SiMe,), N-iC,H,(SiMe,); R = CMe,, R' = C,H,) to give the fluorosilanols R -FSiOH -R' (7-10). The siloxane 16 is obtained in the reaction of [(Me3Si),N],SiF2 (6) with KOH via a 1,3silyl group migration. 7-10 react with butyllithium to give the lithium fluorosilanolates 11 -14. The reaction of these lithium salts with halogensilanes leads to the formation of the halogen functional siloxanes 15, 17-21. Lithiated 16 (22) is substituted by fluorosilanes at the nitrogen (23-25). The cyclic siloxanes 26-28 are formed by thermal LiF elimination from 11 and 12. Dilithiated di-[err-butyldisilanol reacts with 15 to give 2,2,4,6-tetra-rerf-butyl-4,6-diphenylcyclotrisiloxane (29).