title: Reactions of [t-Bu(2)SnO](3) with [t-BuX(2)Si](2) (X = F, Cl). Syntheses and Structures of Novel Stannasiloxanes and of [(t-Bu(2)FSn)(2)O](2), the First Fluorine-Containing Tetraorganodistannoxane(,).
abstract: Di-tert-butyltin oxide, (t-Bu(2)SnO)(3) (1), reacts with 1,2-di-tert-butyltetrachlorodisilane, (t-BuCl(2)Si)(2) (2), to provide the stannasiloxane t-Bu(2)Sn[OSi(OSnCl-t-Bu(2))-t-Bu](2) (4, racemate). The reaction of 1 with 1,2-di-tert-butyltetrafluorodisilane, (t-BuF(2)Si)(2) (3), provides the stannasiloxane [t-Bu(F)SiOSn-t-Bu(2)](2)O (5, meso/racemate mixture) and the tetraorganodistannoxane [t-Bu(2)(F)SnOSn(F)-t-Bu(2)](2) (6). Under loss of (1)/(3) mole equiv of 1, the stannasiloxane 5 is transformed into t-Bu(2)Sn[OSi(F)-t-BuSi(F)-t-BuO](2)Sn-t-Bu(2) (7). Its ten-membered ring structure was elucidated by X-ray analysis. In solution, 7 forms the five-membered ring t-Bu(2)Sn[OSi(F)-t-Bu](2) (7a). The dimeric nature of 6 was confirmed by its crystal structure determination. In solution, 6 exhibits a unique valence tautomerism as evidenced by (19)F and (119)Sn NMR spectroscopy.
authors.affiliation: Lehrstuhl für Anorganische Chemie II, Universität Dortmund, D-44221 Dortmund, Germany, High-Resolution NMR Centre (HNMR), Free University of Brussels (VUB), Pleinlaan 2, B-1050 Brussel, Belgium, and Institute for Inorganic Chemistry, Technical University of Graz, Stremayrgasse 16, A-8010 Graz, Austria.
authors.forename: Jens
authors.initials: J
authors.lastname: Beckmann
authors.forename: Monique
authors.initials: M
authors.lastname: Biesemans
authors.forename: Karl
authors.initials: K
authors.lastname: Hassler
authors.forename: Klaus
authors.initials: K
authors.lastname: Jurkschat
authors.forename: Jose C.
authors.initials: JC
authors.lastname: Martins
authors.forename: Markus
authors.initials: M
authors.lastname: Schürmann
authors.forename: Rudolph
authors.initials: R
authors.lastname: Willem