Titanium Silsesquioxanes Grafted on Three-Dimensionally Netted Polysiloxanes: Catalytic Ensembles for Epoxidation of Alkenes with Aqueous Hydrogen Peroxide
Titanium Silsesquioxanes Grafted on Three-Dimensionally Netted Polysiloxanes: Catalytic Ensembles for Epoxidation of Alkenes with Aqueous Hydrogen Peroxide
作者:Maria D. Skowronska-Ptasinska、Martinus L. W. Vorstenbosch、Rutger A. van Santen、Hendrikus C. L. Abbenhuis
Base-catalyzed cleavage and homologation of polyhedral oligosilsesquioxanes
作者:Frank J. Feher、Raquel Terroba、Joseph W. Ziller
DOI:10.1039/a906397h
日期:——
Readily available Cy6Si6O9 2 (Cy = c-C6H11) reacts with aqueous NEt4OH in THF to afford endo-C2h-Cy6Si6O7(OH)4 3a, which upon further hydrolysis produces CySi(OH)3 fragments capable of reacting with 3a to produce endo-C3-Cy7Si7O9(OH)3 1b; the reaction of 2 with aqueous NEt4OH in the presence of (vinyl)Si(OMe)3 affords endo-Cs-Cy6(vinyl)Si7O9(OH)3 1c via trapping of 3a with monosilanes derived from (vinyl)Si(OMe)3.