Zur wagner-meerwein-analogen 1,2-SiMe3-verschiebung von silicium zu kohlenstoff bei der spaltung von [(trimethylsilyl)-silyl]methyl- ethern

Märkl, Gottfried; Horn, Michael; Schlosser, W.

doi:10.1016/s0040-4039(00)84899-6

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Cited by 13 publications

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“…All these reactions proceed through the silylsulfate 5, and scribed by Märkl et al, is similarly discussed as a synchronous process [8] .…”

mentioning

confidence: 96%

The Acid-Induced Rearrangement of 1-Hydroxyalkyltris(trimethylsilyl)silanes

Sternberg

Oehme²

1998

Eur. J. Inorg. Chem.

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In the presence of strong acids, such as HCl or H2SO4, 1‐hydroxyalkyltris(trimethylsilyl)silanes (Me3Si)3Si−C(OH)R1R2 (1a−f) isomerize by 1,2‐Me3Si/OH exchange to give the trimethylsilylmethylsilanols (Me3Si)2Si(OH)−C(SiMe3)R1R2 (4a−f) [R1,R2: a: Me, Me; b: H, 4‐MeC6H4; c: H, 4‐iPrC6H4; d: H, Mes; e: H, 2‐Me2NC6H4; f: H, 2,4,6‐(MeO)3C6H2]. A mechanism for the isomerization is proposed. In the case of the reaction of 1d with sulfuric acid, the silylsulfate (Me3Si)2Si(OSO3H)−C(SiMe3)HMes (5) was isolated. 5 is the intermediate in the H2SO4‐catalyzed isomerization of 1d and was converted in situ with methanol, acetic anhydride, HF or HCl to give the respective methoxysilane 6, acetoxysilane 7, fluorosilane 8, or chlorosilane 9. Deprotonation of 4a, d, f with sodium hydride causes a further rearrangement, a 1,3‐C,O‐trimethylsilyl migration, to give the siloxanes (Me3Si)2(Me3SiO)Si−CHR1R2 (11a, d, f).

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“…All these reactions proceed through the silylsulfate 5, and scribed by Märkl et al, is similarly discussed as a synchronous process [8] .…”

mentioning

confidence: 96%