Selective epoxidation of cyclohexene to cyclohexene oxide catalyzed by Keggin-type heteropoly compounds using anhydrous urea–hydrogen peroxide as oxidizing reagent and acetonitrile as the solvent

Mechanistic insights in the olefin epoxidation with cyclohexyl hydroperoxide

“…2,9 Although H 2 O 2 is a very suitable oxidant for this application because of its low price and environmental benignity, its high polarity demands for the use of a suitable solvent to overcome solubility problems of the generally apolar olefins. [10][11][12][13][14] Nevertheless, Li and co-workers reported on reaction-controlled phase transfer catalysis for propylene epoxidation with H 2 O 2 in 2001, 15 which has been commercialized for the epoxidation of cyclohexene in China since 2003. 16 An established class of epoxidation catalysts comprises the titano-silicate materials, including molecular sieves TS-1, TS-2 and Ti-BEA and titanium supported on amorphous silica gel.…”

Simple Heteropoly Acids as Water-Tolerant Catalysts in the Oxidation of Alcohols with 34% Hydrogen Peroxide, A Mechanistic Approach

“…The reason may partly be due to the structure and coordination environment of these active species. Ding et al 41 believe that the observed different efficacy for H . Furthermore, the O-O bonds of tungsten complex are longer than that of molybdenum complex; it seems to be essential for the facile transfer of the active oxygen.…”

[(C18H37)2(CH3)2N]7[PW11O39]: a temperature-controlled phase transfer catalyst for olefin epoxidation

“…Recently, many improvements based on tungsten-based catalysts were developed [8][9][10][11][12][13]. But the difficulty of recovery and reuse of those homogeneous catalysts has restricted their wide applications in industrial and laboratorial synthesis.…”