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- W2066088929 abstract "Deca- and dodeca-silsesquioxane cages were prepared by partial rearrangement of octa-silsesquioxanes, R8(SiO1.5)8 (1), to give species of the type R10(SiO1.5)10 (II) and D2d-R12(SiO1.5)12 (III) . This rearrangement is catalysed by sodium acetate, sodium cyanate, sodium sulfite, sodium hydroxide and potassium carbonate in acetone as solvent. The mixture of [Cl-(CH2)3]8(SiO1.5)8 (Ic), [Cl-(CH2)3]10(SiO1.5)10 (IIc) and D2d-[Cl-(CH2)3]12-(SiO1.5)12 (IIIc) can be separated by NP-HPLC. The reaction was also studied in acetonitrile using sodium fluoride, sodium or potassium hexafluorosilicate and 18-crown-6 as catalysts. Simulataneous reaction of (Ic) and [NCS-(CH2)3]8(SiO1.5)8 (If) with sodium acetate in acetone leads to a maxture of octa-, deca- and dodeca-silsesquioxanes with a statistical distribution of the Cl(CH2)3- and NCS(CH2)3-side groups. The 29Si NMR data of the synthesized silsesquioxanes have been collected. The shift data can be calculated following simple additivity rules." @default.
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- W2066088929 date "1997-01-01" @default.
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- W2066088929 title "Cage-rearrangement of silsesquioxanes" @default.
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- W2066088929 doi "https://doi.org/10.1016/s0277-5387(97)00092-2" @default.
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