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Bates, Tim F; Dandekar, Sushama A; Longlet, Jon J; Thomas, Ruthanne D
Journal of organometallic chemistry, 04/2001, Letnik: 625, Številka: 1Journal Article
α-Lithioalkoxysilanes RO(Me 2)SiCH(Li)(X), where R=Me or Et and X=H or SiMe 3, react with carbonyl compounds in hydrocarbon solution to produce alkenes in moderate to high yield via Peterson-type reactions. For X=SiMe 3, the corresponding vinylsilanes are isolated directly following work-up. The reaction is regiospecific and shows fair stereoselectivity. When the carbonyl substrates are cyclic ketones in six- or seven-membered rings, the products are exocyclic alkenes. For X=H, the initial product is a β-hydroxysilane, which is then efficiently converted to the corresponding terminal alkene by heating with sodium acetate in acetic acid. Both types of α-lithioalkoxysilane reagents are amenable to reaction with enolizable carbonyl compounds.
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