Siliciumverbindungen mit starken intramolekularen sterischen Wechselwirkungen, IX [1]. tert-Butylsubstituierte Di- und Trisiloxane / Silicon Compounds with Strong Intramolecular Steric Interactions, IX [1]. tert-Butyl Substituted Di- and Trisiloxane s

Abstract

<jats:p>The overcrowded molecules 1,1,3,3-tetra-tert-butyldisiloxane-1,3-diol (2) and penta-tertbutyldisiloxanol (4) have been obtained during the attempted synthesis of tri-tert-butylsilanol and di-tert-butylsilanediol by reaction of tri-tert-butylsilane and di-tert-butylchlorosilane, resp., with silver nitrate. Compounds 2 and 4 were also formed either by condensation of two molecules of di-tert-butylsilanediol or by co-condensation of the silanediol with tri-tert-butylsilanol in the presence of jo-toluenesulfonic acid. Reactions of tri-tert-butylsilanol with silicon tetrachloride yielded 1,1,1,5,5,5-hexa-tert-butyl-3,3-dichlorotrisiloxane.</jats:p>

Reaction of (t-Bu2SnO)3 with Organohalosilanes. Simple Formation of Open-Chain and Cyclic Stannasiloxanes

“…Compounds 3 , 4 , and t -Bu 2 ClSnOSnCl- t -Bu 2 9 are moisture-sensitive, as was shown by formation of t -Bu 2 Sn(OH)Cl12a and t -Bu 2 Si(OH) 2 12b upon treatment with water of the solution obtained according to Scheme . The last two compounds were isolated and found to be identical with the compounds described in the literature .…”

“…Compounds 3 , 4 , and t -Bu 2 ClSnOSnCl- t -Bu 2 9 are moisture-sensitive, as was shown by formation of t -Bu 2 Sn(OH)Cl12a and t -Bu 2 Si(OH) 2 12b upon treatment with water of the solution obtained according to Scheme . The last two compounds were isolated and found to be identical with the compounds described in the literature . The hydrolysis of stannasiloxane 3 proceeds via formation of t -Bu 2 ClSnOSi(OH)- t -Bu 2 ( 6 ), which was identified in situ by its 29 Si and 119 Sn NMR spectra (Table ).…”

Synthese und Struktur von achtgliedrigen Titan- und Zirkon-haltigen Siloxanringen / Synthesis and Structure of Eight-Membered Titanium and Zirconium Containing Siloxane Rings

“…(/Bu)2Si(OH)2 (1), dargestellt aus (7Bu)2SiHCl und wäßriger Silbernitratlösung [16] oder dessen Lithium -Derivat, (rBu)2Si(OLi)2, reagiert mit den Tetrahalogeniden TiCl4, TiBr4, T il4 und ZrCl4 zu den achtgliedrigen Ringen 2 a -2d (4) 2640 (4) 3898 ( Wir danken dem Fonds der Chemischen Indu strie und der Deutschen Forschungsgemeinschaft für die großzügige U nterstützung dieser Arbeit. Ahmed Mazzah dankt der Alexander von H um boldt für ein Stipendium.…”

Organosilanes

“…632 The silicone Bu l 2Si=O i s not formed. 98 °C) can be made by hydrolysing the chlorosilane in weak aqueous base (equation 655).…”