Alkalisilanolate und -siloxanolate als Precursor für Si–O-Ringe / Alkali Silanolates and Siloxanolates as Precursors for Si–O Rings

Abstract

The disilanol (CMe 3 ) 2 Si(OH) 2 (1) serves as a starting material in the reaction with C 4 H 9 Li and sodium for the construction of the alkali derivatives 2,3,4, and the siloxanes 5,6,7,8. The six-membered cyclosiloxane 10 and the spirocyclic compound 11 are easily prepared in the reaction of [(Me 3 C) 2 Si(OH)] 2 O (8) with 2C 4 H 9 Li and SiF 4 or SnBr 4 . The crystal structures of (Me 3 C) 2 Si(OLi) 2 (3), (Me 3 C) 2 Si(ONa)OH (4), and (Me 3 C) 2 Si(ONa)OSiF(Me 3 C) 2 (9) have been determined and are discussed.