Synthesis, structure, and properties of sodium cis-tetraethylcyclotetrasiloxanolate and new mesomorphic cis-tetra[ethyl(trimethylsiloxy)]cyclotetrasiloxaneстатья
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Аннотация:Hydrolytic condensation of ethyltriethoxysilane in the presence of NaOH (Si: NaOH = 1) gave crystal solvate of sodium cis-tetraethyltetrasiloxanolate {(Na+)4[EtSi(O)O−]4}nL (1, L = EtOH, H2O) in high yield. The molecular structure of compound 1 at L = EtOH, n = 8 was determined by X-ray diffraction analysis. The reaction of compound 1 with trimethylchlorosilane affords cis-tetra[ethyl(trimethylsiloxy)]cyclotetrasiloxane cis-[EtSi(O)OSiMe3]4, which is the first representative of the group of mesomorphic cyclotetrasiloxanes containing alkyl groups.