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This study presents the synthesis of organoboron derivatives of stereoregular 4‐, 6‐, and 12‐unit phenylcyclosilsesquioxanes. All compounds obtained were isolated in good yields (70–80 %) and were fully characterized by 1H, 13C, 29Si, 11B NMR, IR spectroscopy, HRMS ESI, and elemental microanalysis. The structure of the key modifier, obtained for the first time, 4‐(tetramethyl‐1,3,2‐dioxaborolan‐2‐yl)phenyl) dimethylvinylsilane, was also confirmed by single‐crystal XRD.

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A series of mono- and polyfunctional carborane organosilicon derivatives were prepared in good yields based on the hydrosilylation reactions of allylcarboranes with hydride-containing organosilicon compounds such as tetramethyldisiloxane, decamethylpentasiloxane and...

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