Abstract
Deprotonation of 1-hydroxyalkyltris(trimethylsilyl)silanes, (Me3Si)3Si-C(OH)R1R2 (1) with methyl lithium in ether at low temperature leads to transient silenes, (MeSi2)2Si=CR1R2 (2a: R1 = R2 = Me; 2b: R1 = H, R2 = tBu; 2c: R1 = H; R2 = Mes), which dimerize in absence of trapping agents to give 1-isopropenyl-2-isopropyl-1,1,2,2-tetrakis-(trimethylsilyl)disilane 3, (E)-3,4-di-/butyl-1,1,2,2-tetrakis(trimethylsilyl)-1,2-disilacyclo-butane 4 and (E)-1,2,3,8α-tetrahydro-l-mesityl-5,7,8α-trmiethyl-2,2,3,3-tetrakis(trimethyl-silyl)-2,3-disilanaphthalene 5, resp. Deprotonation of 1a-1c with excess organolithium reagents leads to trisilanes 6, the addition products of the nucleophilic organolithium compounds across the SiC bond of the intermediate silenes 2a-2c. Compounds 2b and 2c can also be trapped with 2,3-dimethyl-1,3-butadiene to give the silacyclohex-3-enes 9a and 9b. The interaction of 1a-1c with methyllithium or sodium hydride in THF causes a 1,3-Si-O trimethylsilyl migration resulting in formation of trimethylsiloxybis(trimethylsilyl)silyl-alkanes (Me3Si)2SiH-C(OSiMe3)R1R2 10a-10c.
Original language | English |
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Title of host publication | Organosilicon Chemistry Set |
Subtitle of host publication | From Molecules to Materials |
Publisher | Wiley |
Pages | 389-398 |
Number of pages | 10 |
ISBN (Electronic) | 9783527620777 |
ISBN (Print) | 9783527323470 |
DOIs | |
State | Published - Jun 10 2008 |