MULTIPLE BONDS BETWEEN MAIN-GROUP ELEMENT S AND TRANSITION-METALS .128. METHYLTRIOXORHENIUM(VII) AS OXIDATION CATALYST FOR METAL-CARBONYLS

Methyltrioxorhenium(VII) (MTO), known as an efficient olefin epoxidati on catalyst, also catalyzes the oxidation of metal carbonyls by hydrog en peroxide. Thus, treatment of the metal carbonyl precursor (eta5-C5M e5)Re(CO)3 with H2O2 in the presence of catalytic amounts of MTO at te mperatures ranging between -40 and 25-degrees-C gives ioxo(eta5-pentam ethylcyclopentadienyl)rhenium(VII) in almost quantitative isolated yie ld. Mild reaction conditions and high yields are the particular advant ages of the new synthesis.