| Research Abstract |
The purpose of this research work is the development of precision synthetic method of stereoregular and optically active silicon-containing polymers and the control of their properties.
We have synthesized optically active and syndiotactic-rich polysiloxanes by application of the reactions, such as stereoselective bromination reaction and dehydrogenative polycondensation reaction between hydrosilanes and silanols, which we have developed before. We found that some silicon-containing monomers can be separated by HPLC with commercially available optically active stationary phase to become optically pure. Polyaddition and ring-opening polymerization of resulting optically pure propargylsilane and silacyclobutene gave optically active polycarbosilanes. We also synthesized optically active oligosilanes by stereoselective nucleophilic reaction of optically active silyllithium and optically active chlorosilane, and characterized their stereostrucutures by X-ray diffraction and CD spectroscopy.
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