38049-90-0Relevant academic research and scientific papers
Alkali-metal-directed hydrolytic condensation of trifunctional phenylalkoxysilanes
Pozdniakova, Yulia A.,Lyssenko, Konstantin A.,Korlyukov, Alexandr A.,Blagodatskikh, Inessa V.,Auner, Norbert,Katsoulis, Dimitris,Shchegolikhina, Olga I.
, p. 1253 - 1261 (2004)
The alkali-metal-directed hydrolysis of phenyltrialkoxysilanes, PhSi(OR)3 (R = Me, Et, nBu), was performed under various reaction conditions. The alkali metal ions were used both as templating entities and as structural elements. The crystalline sodium and potassium phenylsiloxanolates (Na-PhS and K-PhS) were obtained in two different molecular compositions based on a cis-tetraphenylcyclotetrasiloxanolate, cis-[PhSi(O)O-] 4, or on a cis-triphenylcyclotrisiloxanolate, cis-[PhSi(O)O -]3, anions assembled into a chain or double-layer supramolecular structure through coordination with alkali cations and hydrogen-bonding contacts. Conditions for selective preparation of crystalline Na-PhS or K-PhS of both structural types were identified. The molecular and crystal structures of [(Na+)3{PhSi(O)O-} 3]·8H2O (2), [(Na+)3{PhSi(O) O-}3]·4H2O·1EtOH (3) and [(K +)3{PhSi(O)O-}3]2· 7H2O·3MeOH (4) were determined by single-crystal X-ray analysis. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.
Synthesis, functionalization and properties of incompletely condensed half cube silsesquioxanes as a potential route to nanoscale Janus particles
Asuncion, Michael Z.,Ronchi, Marco,Abu-Seir, Haya,Laine, Richard M.
experimental part, p. 270 - 281 (2010/11/03)
Multiple literature reports describe the synthesis of [RSiO(OH)]4 or [RSiO(ONa)]4 compounds. Surprisingly, in the majority of cases the OH or ONa groups all lie on the same face of the cyclomers or half cubes. Consequently, it appears possible to couple R containing half cubes with R' containing half cubes to form bi-functional (Janus) silsesquioxane cages or cubes. We report here synthesis of [PhSiO(ONa)]4 and [p-IPhSiO(ONa)]4 half cubes. We thereafter discuss efforts to react the [PhSiO(ONa)]4 salt with (R = Me, vinyl, and cyclohexyl) RSiCl3 in MeOH to produce the compounds {PhSiO[OSi(OMe)2R]}4 species which were characterized using traditional spectroscopic procedures. These compounds were then subjected to acid catalyzed hydrolysis tohydrolytically remove the OMe groups to generate Janus cubes. While it is possible to isolate the target compounds, which were also characterized in detail, the yields were lower than expected perhaps because of competitive hydrolytic cleavage of the Si-O-SiR(OMe)2 linkage.
