Premium
Lithiated Stannasilanes – Building Blocks for Monocyclic Si–Sn Rings
Author(s) -
Hermann Uwe,
Reeske Gregor,
Schürmann Markus,
Uhlig Frank
Publication year - 2001
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200103)627:3<453::aid-zaac453>3.0.co;2-6
Subject(s) - chemistry , tin , lithium diisopropylamide , reactivity (psychology) , solid state , medicinal chemistry , stereochemistry , crystallography , ion , organic chemistry , medicine , alternative medicine , pathology , deprotonation
Dilithiated di(stannyl)oligosilanes ( t Bu 2 Sn(Li)– (SiMe 2 ) n –Sn(Li) t Bu 2 ; 4 , n = 2; 5 , n = 3) were synthesized by the reaction of lithium diisopropylamide (LDA) with the α,ω‐hydrido tin substituted oligosilanes ( t Bu 2 Sn(H)– (SiMe 2 ) n –Sn(H) t Bu 2 ; 1 , n = 2; 2 , n = 3). Surprisingly, the reaction of 1 and 3 ( t Bu 2 Sn(H)–(SiMe 2 ) 4 –Sn(H) t Bu 2 ) with LDA resulted not in the formation of the lithiated compound, but what one can find is the formation of the 5,5‐ditert.butyl‐octamethyl‐1,2,3,4‐tetrasila‐5‐stannacyclopentane ( 8 ) (n = 4) in addition to the expected product 4 (n = 4) and the 3,3,6,6‐tetratert.butyl‐octamethyl‐1,2,4,5‐tetrasila‐3,6‐distannacyclohexane ( 7 ) (n = 3). Reactions of 4 and 5 with dimethyl and diphenyldichlorosilanes yielding monocyclic Si–Sn derivatives ( 9 – 11 ) are also discussed. The solid‐state structures of 7 and 11 were determined by X‐ray crystallography.