Visible light-promoted dihydroxylation of styrenes with water and dioxygen
作者:Bo Yang、Zhan Lu
DOI:10.1039/c7cc06745c
日期:——
The first efficient visible light promoted metal-free dihydroxylation of styrenes with water and dioxygen has been developed for the construction of vicinal alcohols. The protocol was operationally simple with broad substrate scope. The mechanistic studies demonstrated that one of the hydroxyl group came from water and the other one came from molecular oxygen. Additionally, the ß-alkyoxy alcohols could
Aldehyde-catalyzed epoxidation of unactivated alkenes with aqueous hydrogen peroxide
作者:Ierasia Triandafillidi、Maroula G. Kokotou、Dominik Lotter、Christof Sparr、Christoforos G. Kokotos
DOI:10.1039/d1sc02360h
日期:——
organocatalytic epoxidation of unactivated alkenes using aqueous hydrogenperoxide provides various indispensable products and intermediates in a sustainable manner. While formyl functionalities typically undergo irreversible oxidations when activating an oxidant, an atropisomeric two-axis aldehyde capable of catalytic turnover was identified for high-yielding epoxidations of cyclic and acyclic alkenes. The relative
The liquid phase oxidation of alpha-phenyl-1a, alpha-trimethylsilyloxy Ib, alpha-cyclopropyl-1c, alpha-trifluoromethyl-1d styrene, and styrene le with oxygen in chlorobenzene and cumene solution in the temperature range 55-125 degrees C was investigated. The product yields were determined gaschromatographically. The epoxide selectivity increases up to 90 degrees C with increasing temperature. The epoxides of la and Ic rearrange at higher temperatures, therefore their yield decreases. The relative chain propagation constants (k(p)C=C) were determined by competitive oxidations of cumene.
Donnelly,J.A.; Hoey,J.G., Journal of the Chemical Society. Perkin transactions I, 1975, p. 2364 - 2368