Octavinyloctasilsesquioxane: Synthesis and Derivatives
Octavinyloctasilsesquioxane is among the most versatile and widely studied polyhedral oligomeric silsesquioxane (POSS) platforms in hybrid materials chemistry. Its eight peripheral vinyl groups, arranged symmetrically about the cubic silsesquioxane core, consistent with the T8 cage classification , provide an exceptionally rich surface for chemical functionalization through reactions characteristic of terminal alkenes, enabling the rational synthesis of dendrimers, polymer networks, glycoclusters, and metal-coordinating ligands. This article reviews how octavinyloctasilsesquioxane (octavinyl POSS, OVS) is prepared and surveys the principal routes to its derivatives — thiol-ene and radical phosphine addition, epoxidation, platinum-catalysed hydrosilylation, palladium-catalysed Heck coupling and ruthenium-catalysed olefin metathesis — together with the architectures each of them delivers.