title: Silanetriols as Powerful Starting Materials for Selective Condensation to Bulky POSS Cages.
abstract: Controlled condensation reactions of tertiary silanetriols CH3(CH2)n(CH3)2CSi(OH)3(1b-f;n= 1-5) in the presence of trifluoroacetic acid and the hydrolysis of CH3(CH2)6(CH3)2CSiCl3(3) lead to the selective formation of the corresponding disiloxane tetrols [CH3(CH2)n(CH3)2CSi(OH)2]2O (2b-g;n= 1-6) in good yields. The TBAF-driven condensation reactions of the silanetriols CH3(CH2)n(CH3)2CSi(OH)3(1a-c;n= 0-2) as well as of the disiloxane-1,1,3,3-tetrol2d(n= 3) yield in the selective formation of the first T8cages bearing tertiary carbon substituents, CH3(CH2)n(CH3)2C (4a-d;n= 0-3), which was not possible via the condensation of their alkoxysilane counterparts so far. The resulting compounds2b-gand4a-dhave been characterized by multinuclear NMR, MS, and single-crystal X-ray diffraction.
authors.affiliation: Universität Kassel , Institut für Chemie und CINSaT, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
authors.forename: Natascha
authors.initials: N
authors.lastname: Hurkes
authors.affiliation: Universität Kassel , Institut für Chemie und CINSaT, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
authors.forename: Clemens
authors.initials: C
authors.lastname: Bruhn
authors.affiliation: Karl-Franzens-Universität , Institut für Chemie, NAWI Graz, Schubertstraße 1, 8010 Graz, Austria.
authors.forename: Ferdinand
authors.initials: F
authors.lastname: Belaj
authors.affiliation: Universität Kassel , Institut für Chemie und CINSaT, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
authors.forename: Rudolf
authors.initials: R
authors.lastname: Pietschnig