Vom Fluorsilan zum Siloxan — 1,3-Silylgruppenwanderung am Si₃CSiO-Gerüst/ From a Fluorosilane to a Siloxane — 1,3-Migration of Silyl Groups in the Si₃CSiO System

Abstract

<jats:title>Abstract</jats:title><jats:p>The nature of the products which are formed in the reaction of tris(trimethylsilyl)Methylfluorosilanes (Me<jats:sub>3</jats:sub>Si)<jats:sub>3</jats:sub>C -SiF<jats:sub>2</jats:sub>R with KOH depends on the bulkiness of the substituents R. The condensed siloxane is obtained for R = F . The crystal structure determination of this siloxane (Me<jats:sub>3</jats:sub>Si)<jats:sub>3</jats:sub>C -SiF<jats:sub>2</jats:sub>-O -SiF<jats:sub>2</jats:sub>-C (SiMe<jats:sub>3</jats:sub>)<jats:sub>3</jats:sub> shows that the Si -O - Si unit is linear. A fluorosilanol as well as a siloxane could be isolated for R = Me. 1,3-Migration of one or two trimethylsilyl groups from the carbon to the oxygen takes place for R = phenyl, rm-butyl or silylamine, with formation of siloxanes which are isomeres o f the expected silanols.</jats:p>

Improved 29Si NMR detection of sterically protected fluorosilanes using the 29Si(19F)-INEPT technique

“…Sterically protected fluorosilanes have been employed as valuable starting materials for the synthesis of multiple bonded silicon species and/or novel polyfunctional silicon compounds [1][2][3][4][5][6][7][8][9][10]. For silanes, steric protection is usually effected by bulky ligands directly attached to the silicon atom.…”