An Efficient Approach to Monophenyl‐Functionalized Octasilsesquioxanes

Abstract

By controlling the ratio of N-bromosuccinimide (NBS) to trichloro(p-tolyl)silane, [4-(bromomethyl)phenyl]trichlorosilane and trichloro [4-(tribromomethyl)phenyl]silane were selectively prepared for the first time. Then, by treating the above two trichlorosilanes with incompletely condensed silsesquioxane, R 7 Si 7 O 9 (OH) 3 , a (monobromomethyl)phenyltethered octasilsesquioxane and (tribromomethyl)phenyl-

Synthetic application of silicates/silanolates and their hydrolyzed polysilanol siloxanes for polyhedral oligomeric silsesquioxanes (POSSs)

“…The X‐ray analysis of 10a showed two independent molecules (Figure ). Both molecules formed trisilanol dimers upon hydrogen bonds as similarly as other trisilanols [7]. However, siloxane backbone of 10a has C 1 symmetry instead of C 3 v symmetry due to packing of the phenyl substituents.…”

“…Recently, incompletely condensed trisilanolates [R 7 Si 7 O 9 ](ONa) 3 6 have become available as new type of silicate, which are easily prepared compared to the corresponding incompletely condensed trisilanols [R 7 Si 7 O 9 ](OH) 3 10 . In spite of relatively bulkier substituents needed for trisilanol [R 7 Si 7 O 9 ](OH) 3 , the capping reaction of trisilanol was widely applied for syntheses of POSS derivatives [7]…”

N-Bromosuccinimide-based bromination and subsequent functionalization of hydrogen-terminated silicon quantum dots

“…While NBS has been used to functionalize Si wafers and silane molecules, 33,34,37,38 the bromination of H-SiQDs has not been reported to our knowledge. As Si-X bonds are very reactive and difficult to directly characterize and isolate, the success of halogenation is typically conrmed by analyzing the derivatives aer functionalization.…”

“…NBS is a common bromination reagent used in organic synthesis and can be handled in air without a problem. 34,37,38…”

Synthesis and Hydrosilylation of Vinyl-Substituted Open-Cage Silsesquioxanes with Phenylsilanes: Regioselective Synthesis of Trifunctional Silsesquioxanes

“…In scientific literature, the most widely described group is that of completely condensed silsesquioxanes, but an interesting alternative to cubic POSS cages may be incompletely condensed open-cage silsesquioxanes (IC-POSSs; Figure ), which, thanks to their unique structure, may exhibit different physicochemical properties and different reactivity. , Most literature reports about incompletely condensed silsesquioxanes focus on the use of POSS trisilanols as precursors for the synthesis of completely condensed derivatives − , and metallasilsesquioxanes complexes as molecular models for silica-grafted catalytic centers. ,, Liu et al investigated the hydrogen-bonded interaction in POSS silanols and the possibility of their usage as anion receptors to form host–guest complexes . The scientific reports about trifunctional IC-POSSs are scarce.…”