Rhenium, methyltrioxo

Since 1989 organorhenium(VII) oxides, especially the very stable methyltrioxo-rhenium (MTO), have proven to be excellent catalyst precursors for a surprisingly broad variety of processes, among them various oxidation reactions [1-3], This section gives a brief summary of the behavior of MTO and its peroxo derivatives in aqueous multiphase systems. Particular emphasis is given to the well-examined olefin epoxidation reactions. 

Coordination Studies. - It has been observed that methyltrioxo-rhenium(VII) forms air- and moisture-stable trigonal-bipyramidal adducts with several organometallic Lewis bases which have a pyridine nitrogen atom as the donor group. A single-crystal structure of one of the products has been deter-... 

More recently Backvall and coworkers developed a novel and robust system for osmium-catalyzed asymmetric dihydroxylation of olefins by H2O2 with methyltrioxo-rhenium (MTO) as the electron transfer mediator [19]. Interestingly, here MTO catalyzes oxidation of the chiral ligand to its mono-N-oxide, which in turn reoxidizes Os to Os ". This system gives vicinal diols in good yields and high enantiomeric excess up to 99%. 

ReCH3, Rhenium, methyltrioxo-, 33 111 04AgRe, Rhenate(l-), per-, silver, 33 111 O4CI2P2UC36H30, Uranium(Vl), dichlorodioxo-bis(triphenylphosphine oxide)-, 33 204 04F4Ti4C4oH6o, Titanium(IV), fluoro(h -penta-methylcyclopentadienyl)-oxo-, tetramer, 33 236... 

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