title: Silylative coupling versus metathesis--efficient methods for the synthesis of difunctionalized double-decker silsesquioxane derivatives.
abstract: A series of functionalized dialkenylsilsesquioxanes were obtained by efficient and highly stereoselective silylative coupling and cross-metathesis of divinylsubstituted double-decker silsesquioxanes (DDSQ-2SiVi) with substituted styrenes and other olefins. Both reactions proceed highly stereoselectively and lead to nearly quantitative formation of E isomers. The optimized reaction conditions for styrene were adopted for successful silylative coupling polycondensation of DDSQ-2SiVi with 1,4-divinylbenzene yielding stereoregular cooligomer containing double-decker (silsesquioxyl-silylene)-vinylene-phenylene units.
authors.affiliation: Faculty of Chemistry, Department of Organometallic Chemistry, Adam Mickiewicz University in Poznan, Umultowska 89b, 61-614 Poznan (Poland).
authors.forename: Patrycja
authors.initials: P
authors.lastname: Żak
authors.forename: Beata
authors.initials: B
authors.lastname: Dudziec
authors.forename: Maciej
authors.initials: M
authors.lastname: Kubicki
authors.forename: Bogdan
authors.initials: B
authors.lastname: Marciniec
keywords: CH activation; double-decker silsesquioxanes; homogeneous catalysis; metathesis; silylative coupling