Carbodiimide-Promoted Olefin Epoxidation with Aqueous Hydrogen Peroxide
Commercially available carbodiimides in hydroxylic solvents containing hydrogen peroxide with mildly basic or acidic catalysts have been found to promote the epoxidation of olefins. A commercially available 30% aqueous solution of hydrogen peroxide serves as the oxidant for this process. The presumed reactive species is a peroxyisourea generated in situ by the addition of hydrogen peroxide to the carbodiimide.
Majetich, George,Hicks, Rodgers,Sun, Guang-Ri,McGill, Patrick
p. 2564 - 2573
(2007/10/03)
EPOXYDATION EN MILIEU HETEROGENE SOLIDE-LIQUIDE: EFFET DES INTERACTIONS A L'INTERFACE SUR LA STABILITE DE L'YLURE DE DIMETHYLSULFONIUM - CONSEQUENCES SUR LA STEREOCHIMIE DE LA REACTION D'EPOXYDATION
The use of solid-liquid heterogenous system in a low hydrated organic medium during the epoxidation reaction of rigid cyclohexanones stabilizes the dimethylsulfonium ylide.The stereochemistry of the reaction is then modified and results to be different from the one obtained in an anhydrous homogeneous medium.However the ylide stability is not sufficient to lead to a cyclopropyl by-product with the α-ionone.
Borredon, Elisabeth,Delmas, Michel,Gaset, Antoine
p. 1877 - 1880
(2007/10/02)
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