申请人:Government of the United States as Represented by the Secretary of the Air Force
公开号:US20160280725A1
公开(公告)日:2016-09-29
Fluorinated cyclopentene moieties and fluorinated cyclopentene functionalized silica materials are provided. The fluorinated cyclopentene functionalized silica materials include a silica material having the fluorinated cyclopentene moiety covalently bonded thereto. Exemplary silica materials include a polysilsesquioxane, a nanosilica, a microsilica, a silica gel, a silica aerogel, or combinations thereof. The fluorinated cyclopentene moieties are based on a modification of perfluorocyclopentene (i.e., 1,2,3,3,4,4,5,5-octafluoro-1-cyclopentene) by nucleophilic substitution with an appropriate nucleophile having a reactive functional group. Methods for preparing fluorinated cyclopentene moieties and the corresponding fluorinated cyclopentene functionalized silica materials are also provided.
Synthesis of Functionalized Silsesquioxane Nanomaterials by Rhodium‐Catalyzed Carbene Insertion into Si−H Bonds
作者:Jake R. Jagannathan、Karina Targos、Annaliese K. Franz
DOI:10.1002/anie.202110417
日期:2022.1.3
Carbene insertion into Si−Hbonds of silsesquioxane silanes was accomplished using RhII catalysis and diazo compounds as carbene precursors. Silsesquioxanes with up to eight Si−Hbonds were functionalized up to gram-scale. Diazo compounds with a fluorinated octyl group and BODIPY fluorophore were accessed to highlight the utility of diazo chemistry. Further transformations including a cross-coupling
present a highly efficient method for the synthesis of functionalized silsesquioxanes mediated by scandium(III) triflate, which opens up the possibility of introducing a wide variety of functional groups into this class of organosilicon compounds under mild conditions with excellent yields. We also investigated the differences in the activity of the Lewisacid (Sc(OTf)3) and the hidden Brønsted acid (TfOH)
Caged silsesquioxane (polyhedraloligomericsilsesquioxane: POSS) is an important class of organic‐inorganichybrid molecules. The electronic properties of POSS have gradually attracted attention from experimental and computational perspectives, while POSS is generally utilized for reinforcement of polymer materials. Practical synthetic routes to access to aryl‐substituted POSS are effective tools
Rh-catalyzed direct arylation of a polyhedral oligomeric silsesquioxane
作者:Hiroaki Imoto、Satoshi Wada、Kensuke Naka
DOI:10.1039/c7dt01106g
日期:——
The electronic properties of polyhedral oligomericsilsesquioxanes (POSS) have recently been subjected to study. Although theoretical calculations have predicted that POSS can work as an acceptor for π-conjugated organic units, an effective reaction to incorporate aryl groups into a POSS backbone remains to be established. In this work, Rh-catalyzed direct arylation has been developed. Heptaisobutyl-POSS