Stepwise condensation of organyltrichlorosilanes with 1,3-dihydroxytetraorganyldisiloxanes affords 2,8-dichlorodecaorganylcyclohexasiloxanes, the dihydroxy derivatives of which have been separated into the cis and trans isomers.
All the cis-2,8-dihydroxydecaorganylcyclohexasiloxanes, irrespective of the substituants on the silicon atoms either in the diorganylsiloxane moiety or bonded to the functional group, undergo intramolecular cyclization to give decaorganylbicyclo[5.5.1]hexasiloxanes as a result of transannular interaction of the substituants at silicon atoms 2 and 8.
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Makarova, N.N., Lavrukhin, B.D., Timofeeva, T.V. et al. Synthesis and properties of bifunctional decaorganylcyclohexasiloxanes. Russ Chem Bull 34, 1017–1023 (1985). https://doi.org/10.1007/BF01142794
- Silicon Atom
- Trans Isomer
- Intramolecular Cyclization