MMO mimic system

Non-heme iron catalysts containing multidentate nitrogen ligands such as pyri-dines and amines have been studied by various groups [42a, 52-54], Jacobsen and coworkers presented an MMO mimic system for the epoxidation of aliphatic alkenes in which the catalyst self-assembles to form the active species [54] (Scheme 3.5). Interestingly, small amounts of an additive (one equivalent of acetic acid) increased the catalytic performance, presumably due to the intermediate formation of peroxya-cetic acid [55, 56]. The reactions proceeded quickly even with terminal aliphatic alkenes, which are generally considered difficult substrates. Another catalyst system available for the epoxidation of terminal alkenes uses phenanthroline as ligand [57]. [Pg.80]

M. C. White, A. G. Doyle, E. N. Jacobsen, A synthetically useful, self assembling MMO mimic system for catalytic alkene epoxidation with aqueous H2O2, J. Am. Chem. Soc. 123,7194-7195 (2001). [Pg.211]

Various both heterogeneous and homogeneous catalytic systems have been developed for methane oxidation to methanol in gas or liquid phases. Achievements in this field before 2008 are discussed in several previous reviews [10,34,60]. Inspired by the high performance of MMO, Fe- and Cu-containing zeolites were prepared to mimic catalytically active metal-oxide sites and applied for gas-phase oxidation of methane to methanol using N2O [61,62] or O2 [63,64] as oxidizing agents. However, the achieved methanol yields are rather low. [Pg.528]

Big Chemical Encyclopedia