Formation of persulphate from sodium sulphite and molecular oxygen catalysed by H<sub>5</sub>PV<sub>2</sub>Mo<sub>10</sub>O<sub>40</sub>– aerobic epoxidation and hydrolysis
作者:Amir Rubinstein、Raanan Carmeli、Ronny Neumann
DOI:10.1039/c4cc06304j
日期:——
The H5PV2Mo10O40 polyoxometalate catalysed the electron transfer oxidation of sulphite to yield a sulphite radical, SO3 (-) that upon addition of O2 yielded a peroxosulphate species efficient for the H5PV2Mo10O40 catalysed epoxidation of alkenes. The acidic polyoxometalate further catalysed hydrolysis of the epoxide to give vicinal diols in high yields.
Preparation, Characterization and Catalytic Properties of Polyaniline-Supported Metal Complexes
作者:Boyapati M. Choudary、Moumita Roy、Sarabindu Roy、M. Lakshmi Kantam、Bojja Sreedhar、Karasala Vijay Kumar
DOI:10.1002/adsc.200606077
日期:2006.8
Polyaniline-supported Sc, In, Pd, Os and Re catalysts were prepared by using a simple protocol and the thus prepared catalysts were well characterized using FTIR, XPS, UV-Vis/DRS, TGA-DTA. All the catalysts were successfully employed in a wide range of organic transformations such as cyanation and allylation of carbonyl compound, Suzuki coupling of aryl halides and boronic acids, and, most importantly
Hot water as a mild Brønsted acid catalyst in ring opening reactions of epoxides
作者:ZhaoBing Xu、Jin Qu
DOI:10.1007/s11426-011-4323-x
日期:2011.11
Ring opening of extremely hydrophobic epoxides with water, amines, sodium azide and thiophenol was realized in the mixture solvent of water and 1, 4-dioxane under reflux condition. Hot water was believed to act as a mild Brønsted acid catalyst in the epoxide-opening reactions.
The epoxide opening reactions of erythro and threo epoxy alcohols with a variety of nucleophiles, both in the presence and absence of Ti(OiPr)4, were examined. In general, opening of threo epoxy alcohols proceeded faster and with higher selectivity than the same reaction with the corresponding erythro isomers.