Investigation of the Thermal and Photochemical Reactions of Ozone with 2,3-Dimethyl-2-butene
作者:Bridgett E. Coleman、Bruce S. Ault
DOI:10.1021/jp108457w
日期:2010.12.9
The matrixisolation technique, combined with infrared spectroscopy and twin jet codeposition, has been used to characterize intermediates formed during the ozonolysis of 2,3-dimethyl-2-butene (DMB). Absorptions of early intermediates in the twin jet experiments grew up to 200% upon annealing to 35 K. A number of these absorptions have been assigned to the elusive Criegee intermediate (CI) and secondary
Direct catalytic oxidation of lower alkanes in ionic liquid media
作者:E. G. Chepaikin、A. P. Bezruchko、G. N. Menchikova、N. I. Moiseeva、A. E. Gekhman
DOI:10.1134/s096554411405003x
日期:2014.9
systems in ionic liquids as high-boiling-point solvents affects the distribution of propane oxidation products: the acetone yield increases and the yield of alcohols decreases. Propane is oxidized to acetone, bypassing the isopropanol formation step. Methane is oxidized under more severe conditions than propane, giving methyl trifluoroacetate as the main product. Mechanisms of action of the catalytic
reaction through the Mars-van Krevelen mechanism, while Au facilitated the cleavage of C–Hbonds of the adsorbed reactant with the assistance of a base. Its catalytic activity was further increased to 16.5 μmol h−1 (IPA conversion of 82.5%) after the introduction of visiblelight. It is regarded that the photon induced photocatalytic performance was significantly enhanced with the existence of instantaneously
Gold-Catalyzed Cycloisomerization of 1,6,8-Dienyne Carbonates and Esters to<i>cis</i>-Cyclohepta-4,8-diene-Fused Pyrrolidines
作者:Weidong Rao、Sally、Stuart Neil Berry、Philip Wai Hong Chan
DOI:10.1002/chem.201402500
日期:2014.10.6
provides access to cis‐cyclohepta‐4,8‐diene‐fused pyrrolidines efficiently through AuI‐catalyzed cycloisomerization of 1,6,8‐dienyne carbonates and esters at a low catalyst loading of 2 mol % is reported. Starting carbonates and esters with a pendant alkyl group on the terminal alkenyl carbon center were found to favor tandem 1,2‐acyloxy migration/cyclopropanation followed by Coperearrangement of the