61784-26-7Relevant academic research and scientific papers
Ionic hydrogenation of oxyallyl intermediates: The reductive nazarov cyclization
Giese, S?ren,West
, p. 10221 - 10228 (2007/10/03)
Cyclization of tri- and tetrasubstituted dienones 1 under Lewis acidic conditions in the presence of triethylsilane led to formation of either silyl enol ethers 6 or cyclopentanones 7 in good to excellent yields, depending on work-up conditions. The proposed mechanism involves initial Nazarov cyclization to give oxyallyl intermediates 5, which are intercepted via intermolecular transfer of hydride. The reactions proceeded cleanly with as little as 2 equiv. of silane and in most cases catalytic amounts of Lewis acid could be used. Trapping with Et3SiD occurs at the less substituted terminus in unsymmetrical cases. (C) 2000 Elsevier Science Ltd.
The reductive Nazarov cyclization
Giese, Soeren,West
, p. 8393 - 8396 (2007/10/03)
Tri- and tetrasubstituted 1,4-dien-3-ones 1 were treated with Lewis acid in the presence of triethylsilane, furnishing either silyl enol ethers 4 or cyclopentanones 5 in good yields, depending upon work-up conditions. This reaction is presumed to occur th
A significant effect of anion binding ureas on the product ratio in the palladium(II)-catalyzed hydrocarbonylation of alkenes
Scheele, Jan,Timmerman, Peter,Reinhoudt, David N.
, p. 2613 - 2614 (2007/10/03)
Hydrogen bonding of urea derivatives to the anionic ligands X of (dppp)PdX2 catalysts significantly increases the hydroacylation of cyclopentene relative to the hydroformylation, most probably due to a decreased coordination strength of the anionic ligands.
