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The nature of the products which are formed in the reaction of tris(trimethylsilyl)Methylfluorosilanes (Me 3 Si) 3 C -SiF 2 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 3 Si) 3 C -SiF 2 -O -SiF 2 -C (SiMe 3 ) 3  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.

zeitschrift für naturforschung b

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